Subtract 48/42 from 9/20, Solve 9/20

Subtract 48/42 from 9/20

1^st number: 9/20, 2^nd number: 1 6/42

9/20 - 48/42 is -97/140.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 20 × 21 = 420,
9/20 = 9 × 21/20 × 21 = 189/420
Likewise, for the 2nd fraction, since 42 × 10 = 420,
48/42 = 48 × 10/42 × 10 = 480/420
Subtract the two like fractions:
189/420 - 480/420 = 189 - 480/420 = -291/420
After reducing the fraction, the answer is -97/140

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