Subtract 21/9 from 42/10
1st number: 4 2/10, 2nd number: 2 3/9
42/10 - 21/9 is 28/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 9 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 10 × 9 = 90,
42/10 = 42 × 9/10 × 9 = 378/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
21/9 = 21 × 10/9 × 10 = 210/90 - Subtract the two like fractions:
378/90 - 210/90 = 378 - 210/90 = 168/90 - After reducing the fraction, the answer is 28/15
- In mixed form: 113/15
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