Subtract 21/90 from 70/42
1st number: 1 28/42, 2nd number: 21/90
70/42 - 21/90 is 43/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
70/42 = 70 × 15/42 × 15 = 1050/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630 - Subtract the two like fractions:
1050/630 - 147/630 = 1050 - 147/630 = 903/630 - After reducing the fraction, the answer is 43/30
- In mixed form: 113/30
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