Subtract 81/4 from 70/42
1st number: 1 28/42, 2nd number: 20 1/4
70/42 - 81/4 is -223/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
70/42 = 70 × 2/42 × 2 = 140/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
81/4 = 81 × 21/4 × 21 = 1701/84 - Subtract the two like fractions:
140/84 - 1701/84 = 140 - 1701/84 = -1561/84 - After reducing the fraction, the answer is -223/12
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