Answers

Add 20/28 and 98/80

1^st number: 20/28, 2^nd number: 1 18/80

20/28 + 98/80 is 543/280.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 28 × 20 = 560,
   20/28 = 20 × 20/28 × 20 = 400/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   98/80 = 98 × 7/80 × 7 = 686/560
4. Add the two like fractions:
   400/560 + 686/560 = 400 + 686/560 = 1086/560
5. 1086/560 simplified gives 543/280
6. So, 20/28 + 98/80 = 543/280
   In mixed form: 1263/280

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