Subtract 80/21 from 1/20
1st number: 1/20, 2nd number: 3 17/21
1/20 - 80/21 is -1579/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
1/20 = 1 × 21/20 × 21 = 21/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
80/21 = 80 × 20/21 × 20 = 1600/420 - Subtract the two like fractions:
21/420 - 1600/420 = 21 - 1600/420 = -1579/420
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