Answers

Add 90/80 and 72/70

1^st number: 1 10/80, 2^nd number: 1 2/70

90/80 + 72/70 is 603/280.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 70 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 80 × 7 = 560,
   90/80 = 90 × 7/80 × 7 = 630/560
3. Likewise, for the 2nd fraction, since 70 × 8 = 560,
   72/70 = 72 × 8/70 × 8 = 576/560
4. Add the two like fractions:
   630/560 + 576/560 = 630 + 576/560 = 1206/560
5. 1206/560 simplified gives 603/280
6. So, 90/80 + 72/70 = 603/280
   In mixed form: 243/280

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