Subtract 15/50 from 20/84, Solve 20/84

Subtract 15/50 from 20/84

20/84 - 15/50 is -13/210.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 50 is 2100

Next, find the equivalent fraction of both fractional numbers with denominator 2100
For the 1st fraction, since 84 × 25 = 2100,
20/84 = 20 × 25/84 × 25 = 500/2100
Likewise, for the 2nd fraction, since 50 × 42 = 2100,
15/50 = 15 × 42/50 × 42 = 630/2100
Subtract the two like fractions:
500/2100 - 630/2100 = 500 - 630/2100 = -130/2100
After reducing the fraction, the answer is -13/210

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