Answers

Subtract 48/20 from 21/30

1^st number: 21/30, 2^nd number: 2 8/20

21/30 - 48/20 is -17/10.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 30 and 20 is 60
   
   Next, find the equivalent fraction of both fractional numbers with denominator 60
2. For the 1st fraction, since 30 × 2 = 60,
   21/30 = 21 × 2/30 × 2 = 42/60
3. Likewise, for the 2nd fraction, since 20 × 3 = 60,
   48/20 = 48 × 3/20 × 3 = 144/60
4. Subtract the two like fractions:
   42/60 - 144/60 = 42 - 144/60 = -102/60
5. After reducing the fraction, the answer is -17/10

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