Subtract 21/5 from 30/32, Solve 30/32

Subtract 21/5 from 30/32

1^st number: 30/32, 2^nd number: 4 1/5

30/32 - 21/5 is -261/80.

Find the least common denominator or LCM of the two denominators:
LCM of 32 and 5 is 160

Next, find the equivalent fraction of both fractional numbers with denominator 160
For the 1st fraction, since 32 × 5 = 160,
30/32 = 30 × 5/32 × 5 = 150/160
Likewise, for the 2nd fraction, since 5 × 32 = 160,
21/5 = 21 × 32/5 × 32 = 672/160
Subtract the two like fractions:
150/160 - 672/160 = 150 - 672/160 = -522/160
After reducing the fraction, the answer is -261/80

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