Answers

Subtract 21/40 from 45/49

45/49 - 21/40 is 771/1960.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 49 and 40 is 1960
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1960
2. For the 1st fraction, since 49 × 40 = 1960,
   45/49 = 45 × 40/49 × 40 = 1800/1960
3. Likewise, for the 2nd fraction, since 40 × 49 = 1960,
   21/40 = 21 × 49/40 × 49 = 1029/1960
4. Subtract the two like fractions:
   1800/1960 - 1029/1960 = 1800 - 1029/1960 = 771/1960

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