Multiples = 3, 6, 9, 12 ...
Factors = 15 = 1, 3, 5, 15
Prime numbers = 2, 3, 5, 7, 11 ... so
HCF = the highest number that can be divided exactly into each of two or more numbers.
LCM = the lowest quantity that is a multiple of two or more given numbers e.g. 12 is the lowest common multiple of 2, 3, and 4
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Order of operations
B brackets
E exponents
D division
M multiplication
A addition
S subtraction
