Answers

Add 90/70 and 72/80

1^st number: 1 20/70, 2^nd number: 72/80

90/70 + 72/80 is 153/70.

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,
   72/80 = 72 × 7/80 × 7 = 504/560
4. Add the two like fractions:
   720/560 + 504/560 = 720 + 504/560 = 1224/560
5. 1224/560 simplified gives 153/70
6. So, 90/70 + 72/80 = 153/70
   In mixed form: 213/70

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