Subtract 20/42 from 45/18
1st number: 2 9/18, 2nd number: 20/42
45/18 - 20/42 is 85/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 42 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
45/18 = 45 × 7/18 × 7 = 315/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
20/42 = 20 × 3/42 × 3 = 60/126 - Subtract the two like fractions:
315/126 - 60/126 = 315 - 60/126 = 255/126 - After reducing the fraction, the answer is 85/42
- In mixed form: 21/42
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