Prime Factors Worksheet - Ti-15 Explorer, W2 (Page 2 of 5) in pdf

Prime Factors Worksheet - Ti-15 Explorer, W2 Page 2

Student Worksheet 2

TI-15 Explorer

: Prime Factors

™

You can write 72 as the product of only its PRIME factors which means that only prime

numbers can be used so the prime factorisation of:

72 is 2 x 2 x 2 x 3 x 3 (called expanded form) which is usually written in shorthand form as:

72 is 2

x 3

(called the index or exponent form)

( The small 3 indicates that there are 3 twos multiplied together and the small 2 indicates

that there are 2 threes multiplied together.)

T o do this, divide the original number by 2 as many times as you can, then by 3 and so on

with prime numbers only, recording as you go.

d) W rite each of the numbers from the table in worksheet 1 as the product of ONLY its

Prime factors in the table below. You may need to use a prime factor more than once!

– as you can see with 72.

How many factors does this

Number

As the product of only PRIME Factors

number have altogether?

Refer back to Worksheet 1

2 x 2 x 2 x 3 x 3 = 2

x 3

Prime Factors Worksheet - Ti-15 Explorer, W2 Page 2