Subtract 21/10 from 7/84
1st number: 7/84, 2nd number: 2 1/10
7/84 - 21/10 is -121/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 10 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
7/84 = 7 × 5/84 × 5 = 35/420 - Likewise, for the 2nd fraction, since 10 × 42 = 420,
21/10 = 21 × 42/10 × 42 = 882/420 - Subtract the two like fractions:
35/420 - 882/420 = 35 - 882/420 = -847/420 - After reducing the fraction, the answer is -121/60
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