Subtract 90/20 from 21/45
1st number: 21/45, 2nd number: 4 10/20
21/45 - 90/20 is -121/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
21/45 = 21 × 4/45 × 4 = 84/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
90/20 = 90 × 9/20 × 9 = 810/180 - Subtract the two like fractions:
84/180 - 810/180 = 84 - 810/180 = -726/180 - After reducing the fraction, the answer is -121/30
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