Answers

Subtract 72/70 from 15/28

1^st number: 15/28, 2^nd number: 1 2/70

15/28 - 72/70 is -69/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 70 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 28 × 5 = 140,
   15/28 = 15 × 5/28 × 5 = 75/140
3. Likewise, for the 2nd fraction, since 70 × 2 = 140,
   72/70 = 72 × 2/70 × 2 = 144/140
4. Subtract the two like fractions:
   75/140 - 144/140 = 75 - 144/140 = -69/140

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