Prime Factors, HCF, LCM

This applet is a calculator for breaking numbers into their prime factors, and also investigates how to find the HCF (or GCD) and LCM of two numbers.

Author and programmer: Ron Barrow

UK Years 7-11, KS3, KS4, Foundation and Higher GCSE - Number
US Grade 6, Grade 7, Grade 8 - Pre-Algebra

   
           

Instructions below    Waldomaths video    Waldomaths video    Waldomaths video    See also:  Number Factors   Prime numbers - the Sieve of Eratosthenes   PRINT

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How to Use this Applet

With this applet you can investigate prime factors of integers (whole numbers) and also the HCF (Highest Common Factor), and the LCM (Least or Lowest Common Multiple) of two numbers. You can also see how these things relate to each other, and get a fascinating insight into the behaviour of larger numbers. [NB.The HCF is sometimes called the GCD (greatest common divisor).]
You can get the two numbers in two ways: either by entering them in the text boxes at the bottom of the page; or by using the random button at the top of the page - you can choose the maximum number of digits in the random numbers by entering a number from 1 to 7 in the "digits" box at the top of the page.
Play around. There's a great deal to learn about numbers from this applet.