Answers

Subtract 18/80 from 90/70

1^st number: 1 20/70, 2^nd number: 18/80

90/70 - 18/80 is 297/280.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 70 × 8 = 560,
   90/70 = 90 × 8/70 × 8 = 720/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   18/80 = 18 × 7/80 × 7 = 126/560
4. Subtract the two like fractions:
   720/560 - 126/560 = 720 - 126/560 = 594/560
5. After reducing the fraction, the answer is 297/280
6. In mixed form: 117/280

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