Solutions by everydaycalculation.com

1^{st} number: 1 19/21, 2^{nd} number: 3 10/20

4021 + 7020 is 22742.

- 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,

7020 = 70 × 2120 × 21 = 1470420 - Add the two like fractions:

800420 + 1470420 = 800 + 1470420 = 2270420 - 2270/420 simplified gives 22742
- So, 40/21 + 70/20 = 227/42

In mixed form: 51742

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