Subtract 10/54 from 40/21, Solve 1 19/21

Subtract 10/54 from 40/21

1^st number: 1 19/21, 2^nd number: 10/54

40/21 - 10/54 is 325/189.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 21 × 18 = 378,
40/21 = 40 × 18/21 × 18 = 720/378
Likewise, for the 2nd fraction, since 54 × 7 = 378,
10/54 = 10 × 7/54 × 7 = 70/378
Subtract the two like fractions:
720/378 - 70/378 = 720 - 70/378 = 650/378
After reducing the fraction, the answer is 325/189
In mixed form: 1136/189

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