Subtract 12/45 from 12/70, Solve 12/70

Subtract 12/45 from 12/70

12/70 - 12/45 is -2/21.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 45 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 70 × 9 = 630,
12/70 = 12 × 9/70 × 9 = 108/630
Likewise, for the 2nd fraction, since 45 × 14 = 630,
12/45 = 12 × 14/45 × 14 = 168/630
Subtract the two like fractions:
108/630 - 168/630 = 108 - 168/630 = -60/630
After reducing the fraction, the answer is -2/21

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