Subtract 9/42 from 28/21
1st number: 1 7/21, 2nd number: 9/42
28/21 - 9/42 is 47/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
28/21 = 28 × 2/21 × 2 = 56/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
9/42 = 9 × 1/42 × 1 = 9/42 - Subtract the two like fractions:
56/42 - 9/42 = 56 - 9/42 = 47/42 - In mixed form: 15/42
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