Answers

Add 28/15 and 54/72

1^st number: 1 13/15, 2^nd number: 54/72

28/15 + 54/72 is 157/60.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 72 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 15 × 24 = 360,
   28/15 = 28 × 24/15 × 24 = 672/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   54/72 = 54 × 5/72 × 5 = 270/360
4. Add the two like fractions:
   672/360 + 270/360 = 672 + 270/360 = 942/360
5. 942/360 simplified gives 157/60
6. So, 28/15 + 54/72 = 157/60
   In mixed form: 237/60

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