Subtract 10/21 from 54/40, Solve 1 14/40

Subtract 10/21 from 54/40

1^st number: 1 14/40, 2^nd number: 10/21

54/40 - 10/21 is 367/420.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 40 × 21 = 840,
54/40 = 54 × 21/40 × 21 = 1134/840
Likewise, for the 2nd fraction, since 21 × 40 = 840,
10/21 = 10 × 40/21 × 40 = 400/840
Subtract the two like fractions:
1134/840 - 400/840 = 1134 - 400/840 = 734/840
After reducing the fraction, the answer is 367/420

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