Subtract 7/20 from 30/21
1st number: 1 9/21, 2nd number: 7/20
30/21 - 7/20 is 151/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
30/21 = 30 × 20/21 × 20 = 600/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420 - Subtract the two like fractions:
600/420 - 147/420 = 600 - 147/420 = 453/420 - After reducing the fraction, the answer is 151/140
- In mixed form: 111/140
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