Answers

Subtract 72/10 from 25/42

1^st number: 25/42, 2^nd number: 7 2/10

25/42 - 72/10 is -1387/210.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 10 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 42 × 5 = 210,
   25/42 = 25 × 5/42 × 5 = 125/210
3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
   72/10 = 72 × 21/10 × 21 = 1512/210
4. Subtract the two like fractions:
   125/210 - 1512/210 = 125 - 1512/210 = -1387/210

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