Answers

Add 90/72 and 54/80

1^st number: 1 18/72, 2^nd number: 54/80

90/72 + 54/80 is 77/40.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 72 × 10 = 720,
   90/72 = 90 × 10/72 × 10 = 900/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   54/80 = 54 × 9/80 × 9 = 486/720
4. Add the two like fractions:
   900/720 + 486/720 = 900 + 486/720 = 1386/720
5. 1386/720 simplified gives 77/40
6. So, 90/72 + 54/80 = 77/40
   In mixed form: 137/40

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