3 ...
18 ÷ 3 = 6
21 ÷ 3 = 7
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LCD(20, 6) = 60
The greatest common fator of 51 abd 18 is 3.
93
306
20 and 65 is 5 14 and 35 is 7 18 and 42 is 6 24 and 90 is 6 51 and 27 is 3 You do need these in maths, so it is beneficial to learn them. Look for a similarity between both numbers (handiest to spot 2 even numbers for instance)