Subtract 30/90 from 20/7
1st number: 2 6/7, 2nd number: 30/90
20/7 - 30/90 is 53/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 7 × 90 = 630,
20/7 = 20 × 90/7 × 90 = 1800/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
30/90 = 30 × 7/90 × 7 = 210/630 - Subtract the two like fractions:
1800/630 - 210/630 = 1800 - 210/630 = 1590/630 - After reducing the fraction, the answer is 53/21
- In mixed form: 211/21
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