Subtract 84/20 from 80/42
1st number: 1 38/42, 2nd number: 4 4/20
80/42 - 84/20 is -241/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
80/42 = 80 × 10/42 × 10 = 800/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
84/20 = 84 × 21/20 × 21 = 1764/420 - Subtract the two like fractions:
800/420 - 1764/420 = 800 - 1764/420 = -964/420 - After reducing the fraction, the answer is -241/105
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