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Ah... Greatest common factor and lowest common multiple...
You will need to factorise the number into its base factors first. For example take 20 and 28.
28: 2X2X7
20: 2X2X5
Common factors are: 2X2
So the highest common factor is 4.
So the lowest common multiple is gotten by multiplying each other with the factor which they dont have.
2X2X5X7= 140
t...