Knowing if a number is prime or composite can help your child or teen solve problems with fractions. For that reason, I thought I’d find you some online prime number calculators that you can use to help your learner when he is struggling with a problem. These are also handy for finding out if a large number is prime when solving advanced math problems.
The sites below have a wide variety of calculators. Most tell you if a number is prime or not. Some also list factors or give the closest prime number. One is for very advanced math.
Here they are.
Online Prime Number Calculators
Math Is Fun: This page explains prime and composite numbers and has a prime numbers chart and calculator.
Math.com: This site has a simple calculator to determine if a number is prime.
Calculator Soup: Find out if a number is prime or composite and what its factors are on this site.
Archimedes Lab: This site gets bonus points for the design of its calculator. It lets you know if a number is prime. If it isn’t, it tells you the factors and the next closest prime number.
Number Empire: This site has a generator and calculator that tells you if a number is prime and also gives you the option to find out the next closest prime or previous prime.
Utm.edu: For those of you who want to get really fancy, this site has calculators for the nth prime, pi function, and a random prime number.
Know of anyone else who could use these prime number calculators? Invite them to become a Member here so that they can also get access to this list.
More help on this site with teaching math:
- Free Resources for Teaching the Sieve of Erastosthenes
- Free Printable Fraction Manipulatives
- Free Manipulatives for Learning Fractions, Decimals, and Percents
Many blessings,
