Subtract 63/84 from 9/40
9/40 - 63/84 is -21/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 84 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
9/40 = 9 × 21/40 × 21 = 189/840 - Likewise, for the 2nd fraction, since 84 × 10 = 840,
63/84 = 63 × 10/84 × 10 = 630/840 - Subtract the two like fractions:
189/840 - 630/840 = 189 - 630/840 = -441/840 - After reducing the fraction, the answer is -21/40
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