Subtract 84/40 from 9/21
1st number: 9/21, 2nd number: 2 4/40
9/21 - 84/40 is -117/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
9/21 = 9 × 40/21 × 40 = 360/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
84/40 = 84 × 21/40 × 21 = 1764/840 - Subtract the two like fractions:
360/840 - 1764/840 = 360 - 1764/840 = -1404/840 - After reducing the fraction, the answer is -117/70
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