Subtract 20/9 from 36/21
1st number: 1 15/21, 2nd number: 2 2/9
36/21 - 20/9 is -32/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
36/21 = 36 × 3/21 × 3 = 108/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
20/9 = 20 × 7/9 × 7 = 140/63 - Subtract the two like fractions:
108/63 - 140/63 = 108 - 140/63 = -32/63
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