Answers

Add 90/70 and 28/80

1^st number: 1 20/70, 2^nd number: 28/80

90/70 + 28/80 is 229/140.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 70 × 8 = 560,
   90/70 = 90 × 8/70 × 8 = 720/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   28/80 = 28 × 7/80 × 7 = 196/560
4. Add the two like fractions:
   720/560 + 196/560 = 720 + 196/560 = 916/560
5. 916/560 simplified gives 229/140
6. So, 90/70 + 28/80 = 229/140
   In mixed form: 189/140

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