Subtract 10/9 from 21/14, Solve 1 7/14

Subtract 10/9 from 21/14

1^st number: 1 7/14, 2^nd number: 1 1/9

21/14 - 10/9 is 7/18.

Find the least common denominator or LCM of the two denominators:
LCM of 14 and 9 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 14 × 9 = 126,
21/14 = 21 × 9/14 × 9 = 189/126
Likewise, for the 2nd fraction, since 9 × 14 = 126,
10/9 = 10 × 14/9 × 14 = 140/126
Subtract the two like fractions:
189/126 - 140/126 = 189 - 140/126 = 49/126
After reducing the fraction, the answer is 7/18

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