Answers

Subtract 28/30 from 21/20

1^st number: 1 1/20, 2^nd number: 28/30

21/20 - 28/30 is 7/60.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 30 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 30 × 2 = 60,
   28/30 = 28 × 2/30 × 2 = 56/60
4. Subtract the two like fractions:
   63/60 - 56/60 = 63 - 56/60 = 7/60

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