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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