Subtract 6/40 from 16/21, Solve 16/21

Subtract 6/40 from 16/21

16/21 - 6/40 is 257/420.

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,
6/40 = 6 × 21/40 × 21 = 126/840
Subtract the two like fractions:
640/840 - 126/840 = 640 - 126/840 = 514/840
After reducing the fraction, the answer is 257/420

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