Subtract 5/7 from 45/27, Solve 1 18/27

Subtract 5/7 from 45/27

1^st number: 1 18/27, 2^nd number: 5/7

45/27 - 5/7 is 20/21.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 7 is 189

Next, find the equivalent fraction of both fractional numbers with denominator 189
For the 1st fraction, since 27 × 7 = 189,
45/27 = 45 × 7/27 × 7 = 315/189
Likewise, for the 2nd fraction, since 7 × 27 = 189,
5/7 = 5 × 27/7 × 27 = 135/189
Subtract the two like fractions:
315/189 - 135/189 = 315 - 135/189 = 180/189
After reducing the fraction, the answer is 20/21

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