Answers

Subtract 21/4 from 18/70

1^st number: 18/70, 2^nd number: 5 1/4

18/70 - 21/4 is -699/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 4 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 70 × 2 = 140,
   18/70 = 18 × 2/70 × 2 = 36/140
3. Likewise, for the 2nd fraction, since 4 × 35 = 140,
   21/4 = 21 × 35/4 × 35 = 735/140
4. Subtract the two like fractions:
   36/140 - 735/140 = 36 - 735/140 = -699/140

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