Answers

Subtract 21/12 from 70/45

1^st number: 1 25/45, 2^nd number: 1 9/12

70/45 - 21/12 is -7/36.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 45 and 12 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 45 × 4 = 180,
   70/45 = 70 × 4/45 × 4 = 280/180
3. Likewise, for the 2nd fraction, since 12 × 15 = 180,
   21/12 = 21 × 15/12 × 15 = 315/180
4. Subtract the two like fractions:
   280/180 - 315/180 = 280 - 315/180 = -35/180
5. After reducing the fraction, the answer is -7/36

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