Answers

Add 81/70 and 30/80

1^st number: 1 11/70, 2^nd number: 30/80

81/70 + 30/80 is 429/280.

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,
   30/80 = 30 × 7/80 × 7 = 210/560
4. Add the two like fractions:
   648/560 + 210/560 = 648 + 210/560 = 858/560
5. 858/560 simplified gives 429/280
6. So, 81/70 + 30/80 = 429/280
   In mixed form: 1149/280

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