Answers

Add 28/21 and 45/40

1^st number: 1 7/21, 2^nd number: 1 5/40

28/21 + 45/40 is 59/24.

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,
   28/21 = 28 × 40/21 × 40 = 1120/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   45/40 = 45 × 21/40 × 21 = 945/840
4. Add the two like fractions:
   1120/840 + 945/840 = 1120 + 945/840 = 2065/840
5. 2065/840 simplified gives 59/24
6. So, 28/21 + 45/40 = 59/24
   In mixed form: 211/24

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