Answers

Subtract 12/70 from 42/80

42/80 - 12/70 is 99/280.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 70 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 80 × 7 = 560,
   42/80 = 42 × 7/80 × 7 = 294/560
3. Likewise, for the 2nd fraction, since 70 × 8 = 560,
   12/70 = 12 × 8/70 × 8 = 96/560
4. Subtract the two like fractions:
   294/560 - 96/560 = 294 - 96/560 = 198/560
5. After reducing the fraction, the answer is 99/280

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