Subtract 20/45 from 70/21
1st number: 3 7/21, 2nd number: 20/45
70/21 - 20/45 is 26/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
70/21 = 70 × 15/21 × 15 = 1050/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
20/45 = 20 × 7/45 × 7 = 140/315 - Subtract the two like fractions:
1050/315 - 140/315 = 1050 - 140/315 = 910/315 - After reducing the fraction, the answer is 26/9
- In mixed form: 28/9
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