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12/42

We note that both numbers are even, and so will cancel down (divide) by '2'.

Hence

12/42 = 6/21

Again we note that both numbers are multiples of '3'. So cancel down by '3'

Hence

6/21 = 2/7

2/7 will not cancel down any further as both '2' and '7' are prime numbers.

Hence 12/42 = 2/7

NB Fluency with your multiplication tables is critical for this method.

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lenpollock

Lvl 16
2y ago

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