Subtract 81/21 from 80/2
1st number: 40 0/2, 2nd number: 3 18/21
80/2 - 81/21 is 253/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
80/2 = 80 × 21/2 × 21 = 1680/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
81/21 = 81 × 2/21 × 2 = 162/42 - Subtract the two like fractions:
1680/42 - 162/42 = 1680 - 162/42 = 1518/42 - After reducing the fraction, the answer is 253/7
- In mixed form: 361/7
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