Answers

Add 45/20 and 90/21

1^st number: 2 5/20, 2^nd number: 4 6/21

45/20 + 90/21 is 183/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 21 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 20 × 21 = 420,
   45/20 = 45 × 21/20 × 21 = 945/420
3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
   90/21 = 90 × 20/21 × 20 = 1800/420
4. Add the two like fractions:
   945/420 + 1800/420 = 945 + 1800/420 = 2745/420
5. 2745/420 simplified gives 183/28
6. So, 45/20 + 90/21 = 183/28
   In mixed form: 615/28

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