Subtract 70/45 from 7/21
1st number: 7/21, 2nd number: 1 25/45
7/21 - 70/45 is -11/9.
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,
7/21 = 7 × 15/21 × 15 = 105/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
70/45 = 70 × 7/45 × 7 = 490/315 - Subtract the two like fractions:
105/315 - 490/315 = 105 - 490/315 = -385/315 - After reducing the fraction, the answer is -11/9
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