Answers

Subtract 40/70 from 28/72

28/72 - 40/70 is -23/126.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 70 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 72 × 35 = 2520,
   28/72 = 28 × 35/72 × 35 = 980/2520
3. Likewise, for the 2nd fraction, since 70 × 36 = 2520,
   40/70 = 40 × 36/70 × 36 = 1440/2520
4. Subtract the two like fractions:
   980/2520 - 1440/2520 = 980 - 1440/2520 = -460/2520
5. After reducing the fraction, the answer is -23/126

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