Subtract 7/70 from 72/21
1st number: 3 9/21, 2nd number: 7/70
72/21 - 7/70 is 233/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
72/21 = 72 × 10/21 × 10 = 720/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
7/70 = 7 × 3/70 × 3 = 21/210 - Subtract the two like fractions:
720/210 - 21/210 = 720 - 21/210 = 699/210 - After reducing the fraction, the answer is 233/70
- In mixed form: 323/70
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