Answers

Add 81/70 and 2/80

1^st number: 1 11/70, 2^nd number: 2/80

81/70 + 2/80 is 331/280.

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,
   81/70 = 81 × 8/70 × 8 = 648/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   2/80 = 2 × 7/80 × 7 = 14/560
4. Add the two like fractions:
   648/560 + 14/560 = 648 + 14/560 = 662/560
5. 662/560 simplified gives 331/280
6. So, 81/70 + 2/80 = 331/280
   In mixed form: 151/280

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