Answers

Add 21/54 and 49/40

1^st number: 21/54, 2^nd number: 1 9/40

21/54 + 49/40 is 581/360.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 40 is 1080
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1080
2. For the 1st fraction, since 54 × 20 = 1080,
   21/54 = 21 × 20/54 × 20 = 420/1080
3. Likewise, for the 2nd fraction, since 40 × 27 = 1080,
   49/40 = 49 × 27/40 × 27 = 1323/1080
4. Add the two like fractions:
   420/1080 + 1323/1080 = 420 + 1323/1080 = 1743/1080
5. 1743/1080 simplified gives 581/360
6. So, 21/54 + 49/40 = 581/360
   In mixed form: 1221/360

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