Subtract 42/45 from 28/21
1st number: 1 7/21, 2nd number: 42/45
28/21 - 42/45 is 2/5.
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,
28/21 = 28 × 15/21 × 15 = 420/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
42/45 = 42 × 7/45 × 7 = 294/315 - Subtract the two like fractions:
420/315 - 294/315 = 420 - 294/315 = 126/315 - After reducing the fraction, the answer is 2/5
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