Your Ti-Nspire programs are my drug of choice, they are addictive, will enjoy them for rest of my life

Thank you.  I had been hesitating to make the purchase as I had wanted to get the apps for TI Voyage 200; 

but I decided to get the ones for TI-Nspire CAS CX instead, basically because it has more memory available.   

These apps you sell have the potential to become addictive so I most likely will be back for more!  

I think I made the right choice.

So, needless to say, I am very impressed.

Beauty is in the eye of the beholder.  Your programs are my drug of choice.  

I am sure to enjoy them for the remainder of my life.  

They are one of the few things worth buying besides food and a good pair of boots.

Impressed with Calculus Made Easy for Ti-Nspire

Hi Mike

I was so impressed with CME that I bought AME and PME and they are both first-rate.

I’ll be buying more as they appear.

Your apps have made the Nspire a lot more useful to me than it was – in fact, I’m beginning to like it quite a lot.

Congratulations on the hard work, I suspect your nspire apps will be even more successful than the Ti89 apps.

Best wishes

How to Round Numbers with Significant Digits Using Sig Fig Calculator

Significant Figures are used to make a value simpler by identifying the numbers that carry a meaningful representation for that number.

When you identify significant numbers, you basically narrow down a term to the numbers in it that matter.

But finding significant figures is just one way of making a value simpler. There are many other ways that you can use to do the same thing.

If you want to make the value smaller, consisting of a decimal number of various digits, then you can make use of rounding for that purpose.

It is quite easy to round significant figures. The approach works on certain principles or rules that you need to know.

In this article, we are going to share with you how rounding of significant figures works and how you can do it simply for a value or a measurement.

Rounding Significant Figures

When you round a number, it becomes simpler while carrying the same value and bringing almost the same level of results when used in different calculations.

Using the rounded values in mathematical calculations does make the term a little less accurate, but the effect of that is almost unnoticeable. It is only noticeable when you consider measurements at the tiniest scale.

How to Round Significant Figures – Basic Rules

If you are wondering how to round significant figures, then you are at the right place. In this section, we are going to share with you the standard rules and principles that are used to round significant figures.

Rule 1 – You need to select the number where you want the rounding to happen. If the number following that is less than 5, then you need to leave all the terms after that and write down the resulting number.

For example, let’s say we want to round the number 0.7652. We want the rounding to happen at number 5. The number following that is 2 which is less than 5 so nothing will change. The resulting number will be 0.765.

Rule 2 – If the number following the one that you have selected for rounding is greater than 5, you need to increment your selected number by 1 and leave the number following the rounded number.

For example, if you want to round the number 7 in the value 12.6578, then according to the second rule the number will become 12.658. This is because the number following our selected number for rounding was 8 which is greater than 5. That is why we incremented 1 to the rounded number.

How to Round Significant Figures Using the Sig Fig Calculator


If you don’t want to go through the hassle of rounding significant figures manually, then we suggest you check out the significant figures calculator.

Sig Fig calculator is a handy tool that can help you cut down on the time that you need to round significant figures.

The calculator works on the rounding rules to bring you accurate results after rounding a significant figure.

You don’t need to go over the rules for rounding significant figures with this tool. You can simply just go on and use the calculator to round numbers that have significant digits in them.

Here is how you can use this tool to round significant figures:

  • Enter the number in the sig fig calculator
  • Use the scroll bar to choose the Round Value that you prefer
  • Click on the Calculate button and the tool will round the significant figures automatically for you

This is all that you need to do to round numbers with significant digits. There is no manual effort needed on your part to perform the calculation.

Sig Fig Calculator – Best Features

·      Free to Use

The Sig Fig calculator is a free utility for students and teachers that they can use to save time and effort when rounding significant figures.

The tool takes the input from the user and performs the rounding automatically, without any kind of hassle. The results that you get from the calculator are accurate and it works incredibly fast.

·      24/7 Availability

It doesn’t matter where you are or what kind of web browser you are using, you can use the calculator 24/7 to round significant figures.

There are no restrictions for the use of this app, nor there are any kind of limitations. You can visit the calculator from your phone or PC web browser and use it for free to round significant figures.


·      Additional Features

Along with rounding significant figures, the sig fig calculator offers many additional features. For example, it also tells you the total number of significant figures in a value.

The calculator also provided you with the E-notation and the Scientific Notation of the input value. You can copy all these values and use them for various mathematical calculations.

This is what makes the sig fig calculator stand out from all the other options on the internet.

·      Cloud-Based Service

The sig fig calculator is a cloud-based service that runs in your web browser. You don’t need to install a 3rd party app to use it. You can access it simply via your phone.

Since the app is optimized for mobile devices, you won’t need to rely on your PC or laptop for using this calculator.

·      No Registration Needed

The sig fig calculator doesn’t require you to register an account on the website. You can use it without doing any kind of registration.

Since the calculator is free, there is no need for you to register an account for usage. This is what makes this calculator stand out from similar paid services on the internet.


Final Words

Learning the rules for significant figures is valuable, but it is not the quickest way to round them. This is because the process is quite time-consuming, and you just can’t do it right if you don’t have enough time to remember the rules.

This is why the Sig Fig calculator is so important because of how easy it makes for you to round significant figures.

We highly recommend that you check out the Sig Fig calculator to round significant figures in a value.

Guest Posts Submission: Fees and Rules

Please complete the required fields.

$20 per post paid via Paypal to [email protected] within 3 days of Posting.

TinspireApps.com Information:
– 10,000 daily views = 300,000 monthly views
– #1 website: Texas Instruments Graphing Calculators with Step by Step Solutions in Math, Science and Finance
-sister site: www.TI89.com


Posts Must Be 100% Original to TinspireApps.com

Posts must be exclusive to TiNspireApps.com and 100% original. This means:

  • No plagiarism! We use CopyScape and it is at the Executive Editor’s decision whether the offense warrants a warning or removal from the Contributing Experts roster.
  • No self-plagiarism: You can’t “borrow” sentences from your own prior published content, or from company blog posts (or other written materials). If you’re going to use someone else’s words/thoughts, it must be properly attributed.

We don’t accept syndicated posts.

What to Write About

TinspireApps.com deals with Education, Mathematics, Science, Technology, Computers, Emulators, Games and specifically Calculators. We are seeking in-depth, expert advice and educational content. Always try to go beyond the basics/obvious.

The most successful articles tend to be:

  • Lists (e.g., examples, tips, tools, tactics).
  • How-to articles/guides.
  • Explainer posts (e.g., what is…/why x matters).
  • Expert roundups.
  • Thought leadership.
  • A solution to a problem.

Provide actionable tips and practical advice.

Share your own experiences. Don’t rely heavily on quoting influencers, experts, or authorities from other sites.

Be the expert!

What Not to Write About

We do not publish content pertaining to gambling, weapons and firearms, pornography, or other industries/topics that may violate Google’s content policies. Such posts ARE NOT ACCEPTABLE.

Posts Must Be Pitch Free

You aren’t writing to sell a product or recommend a particular product or service.

You’re writing to share your expertise, information, insights, and ideas with our audience.


If you have a relationship with a company or someone mentioned in your post, you must disclose it. Some examples of disclosures:

  • Citing original data/research from your company: “(Disclosure: I work for [insert company name here])”
  • “My case study features the Cleveland Zoo, a client of mine.”
  • “My business partner, Genevieve Focker, wrote the case study below.”

Experiences involving a client or business partner should be approved in advance by your Managing Editor and must contain a disclosure of the relationship in the article. Please note that client, company and colleague mentions will be removed if it does not serve the purpose of adding value for our readers.

Post Length

How long should your post be?

  • Our minimum post length for Contributing Experts is 1,000 words.
  • Most posts are between 1,500 and 2,000 words.
  • If you want to write an in-depth post that is 3,000 words, 4,000 words, or even longer, ask for our approval first!

Note: Longer posts tend to get more pageviews, time on page, and social love. However, they also burn you out a lot quicker. Remember, you could probably turn that monster post into 3 or 4 more targeted posts instead!

The best posts are clear, concise and only as long as they need to be. After all, our readers are busy. Tell them what they need to know and get out.


Try to be concise.

Always try to keep your paragraphs short.

One sentence is fine.

Two sentences is typically OK. But no more than three sentences. Please.

Short paragraphs are easier to understand and digest (particularly on mobile), help drive your point across, and encourage reading in this age of information overload and short attention spans.

SEO Best Practices

Let’s practice what we preach, folks.


Your headline should be interesting enough to entice people to click on it. It should be optimized for search and social media and have a character count of 70 characters maximum.


  • Captions are optional.
  • Always add Alternative Text. This can be the post title or a succinct description of the photo that fits the post’s topic.

Tinspire: PQ Formel und Mitternachts (ABC) Formel

Mit dem TiNSpire kann man die PQ Formel und die Mitternachts (ABC) Formel schrittweise loesen. Mittels der TiNspire APP “Algebra Leicht Gemacht” (download https://www.tinspireapps.com/deutsch/?a=ALGLG )

Diese beiden Formeln erlauben es quadratische Gleichungen zu loesen wie etwa x2+6x+8 = 0 . Hier ist ein Beispiel mit der APP.

Zuerst waehle die Option im Menu:

Gebe die Gleichung ein und schon sieht man die Schritte unten im Fenster.

Bis die finale Loesung unten gefunden ist.

Die Mitternachtsformel kann man auf die gleiche Weise loesen:

Eingabe der Gleichung wie unten gezeigt und die Loesung ist unten

So einfach ist Algebra 😉

Tinspire: Friedmann and other Nonparametric Tests – Step by Step

Performing Nonparametric Statistics Test can easily be performed – step by step – using the TiNspire CX calculator. Check out tests such as Wilcoxon, Wallis-Kruskal and the signed Rank Test at https://tinspireapps.com/blog/perform-non-parametric-tests-such-wilcoxon-kruskal-or-signed-rank-on-the-ti-nspire/

Another example is the Friedmann Test, we will use the data of a wine test at https://www.real-statistics.com/anova-repeated-measures/friedman-test/
Ho: No wine preference vs Ha: some wine preference (white, red or rose) . Ranking the wine taste results as shown below we obtain a Test Statistic of 1.79 which results in a p-value of 0.408267 indicating no significant wine preference.

Here is the same Friedmann Test performed using the TiNspire’s Statistics Made Easy app at https://www.TiNspireapps.com/?a=SPME . First we enter the wine taste data as 3 rows, the ranks are shown to the right accounting for ties as well.

Next , we compute the sum of ranks and their averages.

Now, squaring the ranks and adding them yields 1749.5. The Test Statistics uses that, the number of tasters and the number wines and comes out to be 1.79167

Using the Chi Squared Distribution yields the p-value of 0.40827 which is not below 5% and we thus fail to reject our above stated Null-Hypotheses Ho :

TiNspire : Mathematics Economics Solver

Solve Mathematical Economics Problems using the Ti-NSpire Step by Step, that includes: Math Topics in Economics, Computational Economics, Algebra, Complex Numbers, Exponential and Logarithmic Functions, Calculus, Optimization, Differential and Difference Equations, Matrices and Vectors.

Specifically, find Margin of Profit Marginal Revenue Break Even Point R=C Demand Analysis Continuous Income Stream Price Elasticity Consumer Surplus Producer Surplus Cobb-Douglas Prod. Gini Coefficient Simplex Algorithm Fiscal Multiplier Average Tax Rate Marginal Tax Rate Price Index Real GDP – Expenditure Approach Real GDP – Income Approach GDP Deflator: Nominal GDP to Real GDP Compute Labor Rate Nominal & Real Interest Rate Unemployment Rate and plenty more

TiNspire – Number Theory Solver – Step by Step

Solve any Number Theory problems – Step by Step – using the Number Theory Made Easy app at www.TiNspireApps.com

Watch this Video to see how it can solve all number theory problems:

Solve Prime Numbers, Euclidean Algorithm, Theorems by Collatz, Bezout, Fermat, Euler, Wilson, Law Of Reciprocity, Chinese Remainder etc Perform Modular Arithmetic at all levels, Find GCD, LCM, Sigma Notation, Proof by Induction, Solve Diophantine Equations and any other equations, solve 2×2 and 3×3 system of equations, Solve Arithmetic and Geometric Sequences, Complex Numbers, Quadratic Equations, Complete the Square, Polynomials , Perform Polynomial and Synthetic Division, Rational Zero Theorem, Solve Combinatorics problems involving permutations and combinations. Game Theory , Prisoners Dilemma. All problems can be solved STEP BY STEP

Here is a listing of the app functionality:

  Theorems & Conjectures
   Goldbach Conjecture
   Collatz Conjecture
   Twin Prime Conjecture
   Dirichlet’s Box Principle
   Euclid: Infinitely many primes.
   Prime Number Theorem
   Euler’s Theorem
   Fermat’s Little Theorem
   Fermat’s Last Theorem
   Wilson’s Theorem
   Chinese Remainder Theorem
   Law of Quadratic Reciprocity
   Bezout Theorem
   Find Prime-Factorization
   List Primes between A and B
   Count Primes between A and B
   Find Prime greater/less than A
   Prime Checker
   Coprime Checker
   Euler’s Phi(n)-function
   Find GCD & LCM
   Euclidean Algorithm finds GCD
   Extended Euclidean Algorithm
   Bezout Theorem
   Perfect Numbers (Euclid-Euler Theorem)
   Mersenne Numbers
   Amicable Numbers
       Modular Arithmetic
       Compute a mod m
       Create table mod m
       Compute a+b
       Compute a^n mod m
       Find Inverse of a mod m
       Find Order of a mod m
       Primitive Root mod m
       Solve ax=b mod m
       Solve x^2=a mod m
       Solve ax^2+bx+c=0 mod m
       Legendre Symbol
       Law of Quadratic Reciprocity
     Find GCD & LCM
     List Divisors of N
     Sigma Σ-Notation
     Divisibility Rules
     Proof By Induction (Sums)
     Proof By Induction (Products)
       Diophantine Equations
       Count Integers given Range given N
       Count Integers divisble by N and/or M
       Integer Solutions to 1 Eqn. with 2 Variables
       Integer Solutions to 1 Eqn. with 3 Variables
       Try: Non-Integer Solutions to 1 Equation
     Solve any Equation or Inequality
     Solve 2×2 system – Step by Step
     Solve 3×3 system – Step by Step
     Simplify & Evaluate
     Find Common Denominator
     Find Proper Fractions
     Solve Proportion (Ratio) Problems
     Absolute and Percent Change
          Read Truth Tables
          Read Proposition Laws
          Read Conditional
          Read BiConditional
          Read Set Theory: 10 Facts
          Read Set Theory: 9 Laws
       Polynomials & Sequences
       All-in-one-Polynomial Explorer
       Find Degree
       Find Roots
       Polynomial Division & Remainder
       Synthetic Division
       Explicit Sequence & Partial Sum
       Recursive Sequence & Partial Sum
       Sequence Formula Finder
       Geometric Sequence & Series
       Arithmetic Sequence
          Quadratic Equations & Complex Numbers
          Do the Quadratic Equation
          Complete the Square
          Complete the Square to find Zeros
          Complete the Square to find Vertex
          One Complex Number :  All-in-one-Explorer
          Two Complex Numbers : All-in-one-Explorer
           n1*n2*n3*.. = Multiplication Principle
           n! = Number of Rearrangements
           Compute n!*m!
           nPr = Number of ways to rearrange r given n
           nCr = Number of ways to pick r given n
         Game Theory
         Read Introduction & Applications
         Read Symmetric vs Non-Symmetric Games
         Read Cooperative vs Non-Cooperative Games
         Read Zero-Sum Games
         Read Simultaneous vs Non-Simultaneous            Games
         Read Symmetric vs Non-Symmetric Games
         Read Prisoners Dilemma
         Read Strictly Determined Games
         Read Perfect vs Imperfect Information