1

40 ÷ 8 = 5 and 40 ÷ 5 = 8.

2

We say that 8 and 5 are factors of 40. If we can divide a whole number by another whole number without remainder, the second number is a factor of the first.

3

The numbers 1, 2, 4, 5, 8, 10, 20 and 40 all divide into 40. They are all factors of 40. We can write 40 as a product of two factors in eight ways:
40
= 1 x 40
= 2 x 20
= 4 x 10
= 5 x 8
= 8 x 5
= 10 x 4
= 20 x 2
= 40 x 1

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