Subtract 7/21 from 15/5
1st number: 3 0/5, 2nd number: 7/21
15/5 - 7/21 is 8/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
15/5 = 15 × 21/5 × 21 = 315/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
7/21 = 7 × 5/21 × 5 = 35/105 - Subtract the two like fractions:
315/105 - 35/105 = 315 - 35/105 = 280/105 - After reducing the fraction, the answer is 8/3
- In mixed form: 22/3
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