Subtract 70/30 from 3/7, Solve 3/7 - 2 10/30 as a fraction

Subtract 70/30 from 3/7

1^st number: 3/7, 2^nd number: 2 10/30

3/7 - 70/30 is -40/21.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 30 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 7 × 30 = 210,
3/7 = 3 × 30/7 × 30 = 90/210
Likewise, for the 2nd fraction, since 30 × 7 = 210,
70/30 = 70 × 7/30 × 7 = 490/210
Subtract the two like fractions:
90/210 - 490/210 = 90 - 490/210 = -400/210
After reducing the fraction, the answer is -40/21

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