Answers

Subtract 70/35 from 20/72

1^st number: 20/72, 2^nd number: 2 0/35

20/72 - 70/35 is -31/18.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 35 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 72 × 35 = 2520,
   20/72 = 20 × 35/72 × 35 = 700/2520
3. Likewise, for the 2nd fraction, since 35 × 72 = 2520,
   70/35 = 70 × 72/35 × 72 = 5040/2520
4. Subtract the two like fractions:
   700/2520 - 5040/2520 = 700 - 5040/2520 = -4340/2520
5. After reducing the fraction, the answer is -31/18

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