Answers

Add 21/90 and 45/28

1^st number: 21/90, 2^nd number: 1 17/28

21/90 + 45/28 is 773/420.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 28 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 90 × 14 = 1260,
   21/90 = 21 × 14/90 × 14 = 294/1260
3. Likewise, for the 2nd fraction, since 28 × 45 = 1260,
   45/28 = 45 × 45/28 × 45 = 2025/1260
4. Add the two like fractions:
   294/1260 + 2025/1260 = 294 + 2025/1260 = 2319/1260
5. 2319/1260 simplified gives 773/420
6. So, 21/90 + 45/28 = 773/420
   In mixed form: 1353/420

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