Subtract 9/40 from 16/21
16/21 - 9/40 is 451/840.
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,
16/21 = 16 × 40/21 × 40 = 640/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
9/40 = 9 × 21/40 × 21 = 189/840 - Subtract the two like fractions:
640/840 - 189/840 = 640 - 189/840 = 451/840
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