Answers

Add 81/72 and 6/90

1^st number: 1 9/72, 2^nd number: 6/90

81/72 + 6/90 is 143/120.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 90 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 72 × 5 = 360,
   81/72 = 81 × 5/72 × 5 = 405/360
3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
   6/90 = 6 × 4/90 × 4 = 24/360
4. Add the two like fractions:
   405/360 + 24/360 = 405 + 24/360 = 429/360
5. 429/360 simplified gives 143/120
6. So, 81/72 + 6/90 = 143/120
   In mixed form: 123/120

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