Answers

Subtract 42/90 from 4/70

4/70 - 42/90 is -43/105.

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,
   4/70 = 4 × 9/70 × 9 = 36/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   42/90 = 42 × 7/90 × 7 = 294/630
4. Subtract the two like fractions:
   36/630 - 294/630 = 36 - 294/630 = -258/630
5. After reducing the fraction, the answer is -43/105

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