Answers

Add 42/72 and 45/28

1^st number: 42/72, 2^nd number: 1 17/28

42/72 + 45/28 is 46/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 28 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 72 × 7 = 504,
   42/72 = 42 × 7/72 × 7 = 294/504
3. Likewise, for the 2nd fraction, since 28 × 18 = 504,
   45/28 = 45 × 18/28 × 18 = 810/504
4. Add the two like fractions:
   294/504 + 810/504 = 294 + 810/504 = 1104/504
5. 1104/504 simplified gives 46/21
6. So, 42/72 + 45/28 = 46/21
   In mixed form: 24/21

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