Answers

Add 4/84 and 28/80

4/84 + 28/80 is 167/420.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 80 is 1680
2. For the 1st fraction, since 84 × 20 = 1680,
   4/84 = 4 × 20/84 × 20 = 80/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   28/80 = 28 × 21/80 × 21 = 588/1680
4. Add the two fractions:
   80/1680 + 588/1680 = 80 + 588/1680 = 668/1680
5. 668/1680 simplified gives 167/420
6. So, 4/84 + 28/80 = 167/420

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