Formulas and rules
Every key math formula and rule, organised by topic and school level, with examples and study tips.
Arithmetic 3
M2
Prime factorization
n = 2^a x 3^b x 5^c x ...
Every whole number over 1 is a product of primes.
M2
HCF and LCM
The HCF is the largest shared factor. The LCM is the smallest shared multiple.
M2
Decimals
Decimals show parts of a whole using tenths, hundredths and thousandths. Line up the decimal points to add.