The basic idea of multiplication is repeated addition.

For example: 5 × 3 = 5 + 5 + 5 = 15

But as well as multiplying by whole numbers, you can also multiply by fractions or decimals.

For example 5 × 3½ = 5 + 5 + 5 + (half of 5) = 17.5

For example: 5 × 3 = 5 + 5 + 5 = 15

But as well as multiplying by whole numbers, you can also multiply by fractions or decimals.

For example 5 × 3½ = 5 + 5 + 5 + (half of 5) = 17.5