Answers

Add 27/21 and 54/40

1^st number: 1 6/21, 2^nd number: 1 14/40

27/21 + 54/40 is 369/140.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 21 × 40 = 840,
   27/21 = 27 × 40/21 × 40 = 1080/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   54/40 = 54 × 21/40 × 21 = 1134/840
4. Add the two like fractions:
   1080/840 + 1134/840 = 1080 + 1134/840 = 2214/840
5. 2214/840 simplified gives 369/140
6. So, 27/21 + 54/40 = 369/140
   In mixed form: 289/140

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