Answers

Subtract 3/90 from 90/70

1^st number: 1 20/70, 2^nd number: 3/90

90/70 - 3/90 is 263/210.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 70 × 9 = 630,
   90/70 = 90 × 9/70 × 9 = 810/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   3/90 = 3 × 7/90 × 7 = 21/630
4. Subtract the two like fractions:
   810/630 - 21/630 = 810 - 21/630 = 789/630
5. After reducing the fraction, the answer is 263/210
6. In mixed form: 153/210

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