Answers

Subtract 70/15 from 21/20

1^st number: 1 1/20, 2^nd number: 4 10/15

21/20 - 70/15 is -217/60.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 15 is 60
   
   Next, find the equivalent fraction of both fractional numbers with denominator 60
2. For the 1st fraction, since 20 × 3 = 60,
   21/20 = 21 × 3/20 × 3 = 63/60
3. Likewise, for the 2nd fraction, since 15 × 4 = 60,
   70/15 = 70 × 4/15 × 4 = 280/60
4. Subtract the two like fractions:
   63/60 - 280/60 = 63 - 280/60 = -217/60

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