Subtract 20/84 from 45/30, Solve 1 15/30

Subtract 20/84 from 45/30

1^st number: 1 15/30, 2^nd number: 20/84

45/30 - 20/84 is 53/42.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 84 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 30 × 14 = 420,
45/30 = 45 × 14/30 × 14 = 630/420
Likewise, for the 2nd fraction, since 84 × 5 = 420,
20/84 = 20 × 5/84 × 5 = 100/420
Subtract the two like fractions:
630/420 - 100/420 = 630 - 100/420 = 530/420
After reducing the fraction, the answer is 53/42
In mixed form: 111/42

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