Answers

Add 72/80 and 90/28

1^st number: 72/80, 2^nd number: 3 6/28

72/80 + 90/28 is 144/35.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 28 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 80 × 7 = 560,
   72/80 = 72 × 7/80 × 7 = 504/560
3. Likewise, for the 2nd fraction, since 28 × 20 = 560,
   90/28 = 90 × 20/28 × 20 = 1800/560
4. Add the two like fractions:
   504/560 + 1800/560 = 504 + 1800/560 = 2304/560
5. 2304/560 simplified gives 144/35
6. So, 72/80 + 90/28 = 144/35
   In mixed form: 44/35

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