Subtract 70/21 from 12/10, Solve 1 2/10

Subtract 70/21 from 12/10

1^st number: 1 2/10, 2^nd number: 3 7/21

12/10 - 70/21 is -32/15.

Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 10 × 21 = 210,
12/10 = 12 × 21/10 × 21 = 252/210
Likewise, for the 2nd fraction, since 21 × 10 = 210,
70/21 = 70 × 10/21 × 10 = 700/210
Subtract the two like fractions:
252/210 - 700/210 = 252 - 700/210 = -448/210
After reducing the fraction, the answer is -32/15

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