Subtract 42/21 from 7/48, Solve 7/48

Subtract 42/21 from 7/48

1^st number: 7/48, 2^nd number: 2 0/21

7/48 - 42/21 is -89/48.

Find the least common denominator or LCM of the two denominators:
LCM of 48 and 21 is 336

Next, find the equivalent fraction of both fractional numbers with denominator 336
For the 1st fraction, since 48 × 7 = 336,
7/48 = 7 × 7/48 × 7 = 49/336
Likewise, for the 2nd fraction, since 21 × 16 = 336,
42/21 = 42 × 16/21 × 16 = 672/336
Subtract the two like fractions:
49/336 - 672/336 = 49 - 672/336 = -623/336
After reducing the fraction, the answer is -89/48

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