Subtract 45/27 from 10/42, Solve 10/42

Subtract 45/27 from 10/42

1^st number: 10/42, 2^nd number: 1 18/27

10/42 - 45/27 is -10/7.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 27 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 42 × 9 = 378,
10/42 = 10 × 9/42 × 9 = 90/378
Likewise, for the 2nd fraction, since 27 × 14 = 378,
45/27 = 45 × 14/27 × 14 = 630/378
Subtract the two like fractions:
90/378 - 630/378 = 90 - 630/378 = -540/378
After reducing the fraction, the answer is -10/7

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