Solutions by everydaycalculation.com

1^{st} number: 1 19/21, 2^{nd} number: 1 8/20

4021 + 2820 is 347105.

- Find the least common denominator or LCM of the two denominators:

LCM of 21 and 20 is**420**

Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,

4021 = 40 × 2021 × 20 = 800420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,

2820 = 28 × 2120 × 21 = 588420 - Add the two like fractions:

800420 + 588420 = 800 + 588420 = 1388420 - 1388/420 simplified gives 347105
- So, 40/21 + 28/20 = 347/105

In mixed form: 332105

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