Subtract 63/42 from 25/18, Solve 1 7/18

Subtract 63/42 from 25/18

1^st number: 1 7/18, 2^nd number: 1 21/42

25/18 - 63/42 is -1/9.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 42 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
25/18 = 25 × 7/18 × 7 = 175/126
Likewise, for the 2nd fraction, since 42 × 3 = 126,
63/42 = 63 × 3/42 × 3 = 189/126
Subtract the two like fractions:
175/126 - 189/126 = 175 - 189/126 = -14/126
After reducing the fraction, the answer is -1/9

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