Answers

Add 54/40 and 21/84

1^st number: 1 14/40, 2^nd number: 21/84

54/40 + 21/84 is 8/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 84 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 40 × 21 = 840,
   54/40 = 54 × 21/40 × 21 = 1134/840
3. Likewise, for the 2nd fraction, since 84 × 10 = 840,
   21/84 = 21 × 10/84 × 10 = 210/840
4. Add the two like fractions:
   1134/840 + 210/840 = 1134 + 210/840 = 1344/840
5. 1344/840 simplified gives 8/5
6. So, 54/40 + 21/84 = 8/5
   In mixed form: 13/5

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