Answers

Subtract 49/90 from 2/21

2/21 - 49/90 is -283/630.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 21 × 30 = 630,
   2/21 = 2 × 30/21 × 30 = 60/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   49/90 = 49 × 7/90 × 7 = 343/630
4. Subtract the two like fractions:
   60/630 - 343/630 = 60 - 343/630 = -283/630

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