Subtract 40/84 from 72/21
1st number: 3 9/21, 2nd number: 40/84
72/21 - 40/84 is 62/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
72/21 = 72 × 4/21 × 4 = 288/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
40/84 = 40 × 1/84 × 1 = 40/84 - Subtract the two like fractions:
288/84 - 40/84 = 288 - 40/84 = 248/84 - After reducing the fraction, the answer is 62/21
- In mixed form: 220/21
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