Answers

Subtract 49/54 from 90/21

1^st number: 4 6/21, 2^nd number: 49/54

90/21 - 49/54 is 1277/378.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 54 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 21 × 18 = 378,
   90/21 = 90 × 18/21 × 18 = 1620/378
3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
   49/54 = 49 × 7/54 × 7 = 343/378
4. Subtract the two like fractions:
   1620/378 - 343/378 = 1620 - 343/378 = 1277/378
5. In mixed form: 3143/378

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