Answers

Subtract 90/20 from 60/70

1^st number: 60/70, 2^nd number: 4 10/20

60/70 - 90/20 is -51/14.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 20 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 70 × 2 = 140,
   60/70 = 60 × 2/70 × 2 = 120/140
3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
   90/20 = 90 × 7/20 × 7 = 630/140
4. Subtract the two like fractions:
   120/140 - 630/140 = 120 - 630/140 = -510/140
5. After reducing the fraction, the answer is -51/14

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