Answers

Add 84/20 and 28/72

1^st number: 4 4/20, 2^nd number: 28/72

84/20 + 28/72 is 413/90.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 72 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 20 × 18 = 360,
   84/20 = 84 × 18/20 × 18 = 1512/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   28/72 = 28 × 5/72 × 5 = 140/360
4. Add the two like fractions:
   1512/360 + 140/360 = 1512 + 140/360 = 1652/360
5. 1652/360 simplified gives 413/90
6. So, 84/20 + 28/72 = 413/90
   In mixed form: 453/90

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