Subtract 7/80 from 72/21
1st number: 3 9/21, 2nd number: 7/80
72/21 - 7/80 is 1871/560.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
72/21 = 72 × 80/21 × 80 = 5760/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
7/80 = 7 × 21/80 × 21 = 147/1680 - Subtract the two like fractions:
5760/1680 - 147/1680 = 5760 - 147/1680 = 5613/1680 - After reducing the fraction, the answer is 1871/560
- In mixed form: 3191/560
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