Answers

Subtract 27/20 from 28/70

1^st number: 28/70, 2^nd number: 1 7/20

28/70 - 27/20 is -19/20.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 20 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 70 × 2 = 140,
   28/70 = 28 × 2/70 × 2 = 56/140
3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
   27/20 = 27 × 7/20 × 7 = 189/140
4. Subtract the two like fractions:
   56/140 - 189/140 = 56 - 189/140 = -133/140
5. After reducing the fraction, the answer is -19/20

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