Subtract 45/21 from 18/32, Solve 18/32

Subtract 45/21 from 18/32

1^st number: 18/32, 2^nd number: 2 3/21

18/32 - 45/21 is -177/112.

Find the least common denominator or LCM of the two denominators:
LCM of 32 and 21 is 672

Next, find the equivalent fraction of both fractional numbers with denominator 672
For the 1st fraction, since 32 × 21 = 672,
18/32 = 18 × 21/32 × 21 = 378/672
Likewise, for the 2nd fraction, since 21 × 32 = 672,
45/21 = 45 × 32/21 × 32 = 1440/672
Subtract the two like fractions:
378/672 - 1440/672 = 378 - 1440/672 = -1062/672
After reducing the fraction, the answer is -177/112

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