Maths — Number Foundations — HCF and LCM + 5 more topics

When we talk about factors, we mean numbers that divide exactly into another number. For example, the factors of 12 are 1, 2, 3, 4, 6, and 12.
Multiples are what you get when you multiply a number by an integer. For example, the multiples of 3 are 3, 6, 9, 12, 15, and so on.

Powers and indices (they mean the same thing!) describe how many times a base number is multiplied by itself. For example, in $2^3$, 2 is the base and 3 is the power or index. It means $2 \times 2 \times 2$.