Answers

Subtract 40/7 from 21/10

1^st number: 2 1/10, 2^nd number: 5 5/7

21/10 - 40/7 is -253/70.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 10 and 7 is 70
   
   Next, find the equivalent fraction of both fractional numbers with denominator 70
2. For the 1st fraction, since 10 × 7 = 70,
   21/10 = 21 × 7/10 × 7 = 147/70
3. Likewise, for the 2nd fraction, since 7 × 10 = 70,
   40/7 = 40 × 10/7 × 10 = 400/70
4. Subtract the two like fractions:
   147/70 - 400/70 = 147 - 400/70 = -253/70

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