Answers

Subtract 63/80 from 84/21

1^st number: 4 0/21, 2^nd number: 63/80

84/21 - 63/80 is 257/80.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 21 × 80 = 1680,
   84/21 = 84 × 80/21 × 80 = 6720/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   63/80 = 63 × 21/80 × 21 = 1323/1680
4. Subtract the two like fractions:
   6720/1680 - 1323/1680 = 6720 - 1323/1680 = 5397/1680
5. After reducing the fraction, the answer is 257/80
6. In mixed form: 317/80

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