Answers

Subtract 21/30 from 2/42

2/42 - 21/30 is -137/210.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 30 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 42 × 5 = 210,
   2/42 = 2 × 5/42 × 5 = 10/210
3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
   21/30 = 21 × 7/30 × 7 = 147/210
4. Subtract the two like fractions:
   10/210 - 147/210 = 10 - 147/210 = -137/210

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