Answers

Add 42/28 and 21/90

1^st number: 1 14/28, 2^nd number: 21/90

42/28 + 21/90 is 26/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 90 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 28 × 45 = 1260,
   42/28 = 42 × 45/28 × 45 = 1890/1260
3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
   21/90 = 21 × 14/90 × 14 = 294/1260
4. Add the two like fractions:
   1890/1260 + 294/1260 = 1890 + 294/1260 = 2184/1260
5. 2184/1260 simplified gives 26/15
6. So, 42/28 + 21/90 = 26/15
   In mixed form: 111/15

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