In the set of Whole numbers 0, 1, 2, 3, 4, 5, 6, .... there is an amazing rule about composite numbers. Composite numbers are ones which are not prime; they have at least one factor besides the number itself and 1.For example:
Here's the amazing part:
Let's take the number 60 for example. We know it must be composite, because it will divide by 2 as well as by 1 and 60. The 'prime factors' rule says that there must be some combination of prime numbers that multiply together to give 60. Here are the first ten prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29. Can you make 60 by multiplying some of these together? Here's a hint ... you can use a prime number more than once. The answer is that you'll get 60 if you multiply 2 x 2 x 3 x 5. Try it.The rule works for ANY composite number. Here's how you get 124: 124 = 2 x 2 x 31
Now you try one ... find the prime factors of 162
When you think you know the answer, go on to the second page ... |