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Important Types of Numbers

FACTOR ­ A factor of a number will divide exactly into the number.

Example ­ The factors of 12 are 1, 2, 3, 4, 6 and 12

PRIME NUMBER ­ A number with exactly two factors.

Example ­ 11 is a prime number as its only…

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It does not matter which path you take, if your multiplications are correct, you will always get
the same answer.
If you want to look smart, write your answers using powers.



LOWEST COMMON MULTIPLE ­ The smallest value which is a multiple of both
numbers.

Example ­ Find the lowest…

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Past Paper Questions




108

2 54

2 27 108 = 2 x 2 x 3 x 3 x 3

3 9 = 22 x 32

3 3



Factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72
Largest of these which divides exactly…

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