Subtract 21/80 from 18/9
1st number: 2 0/9, 2nd number: 21/80
18/9 - 21/80 is 139/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 9 × 80 = 720,
18/9 = 18 × 80/9 × 80 = 1440/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
21/80 = 21 × 9/80 × 9 = 189/720 - Subtract the two like fractions:
1440/720 - 189/720 = 1440 - 189/720 = 1251/720 - After reducing the fraction, the answer is 139/80
- In mixed form: 159/80
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