Solutions by everydaycalculation.com

1st number: 21/84, 2nd number: 1 7/35

21/84 + 42/35 is 29/20.

1. Find the least common denominator or LCM of the two denominators:
LCM of 84 and 35 is 420
2. For the 1st fraction, since 84 × 5 = 420,
21/84 = 21 × 5/84 × 5 = 105/420
3. Likewise, for the 2nd fraction, since 35 × 12 = 420,
42/35 = 42 × 12/35 × 12 = 504/420
105/420 + 504/420 = 105 + 504/420 = 609/420
5. 609/420 simplified gives 29/20
6. So, 21/84 + 42/35 = 29/20
In mixed form: 19/20

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