Subtract 27/21 from 4/10, Solve 4/10

Subtract 27/21 from 4/10

1^st number: 4/10, 2^nd number: 1 6/21

4/10 - 27/21 is -31/35.

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,
4/10 = 4 × 21/10 × 21 = 84/210
Likewise, for the 2nd fraction, since 21 × 10 = 210,
27/21 = 27 × 10/21 × 10 = 270/210
Subtract the two like fractions:
84/210 - 270/210 = 84 - 270/210 = -186/210
After reducing the fraction, the answer is -31/35

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