Solutions by everydaycalculation.com

1^{st} number: 1 19/21, 2^{nd} number: 35/40

4021 + 3540 is 467168.

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

LCM of 21 and 40 is**840**

Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,

4021 = 40 × 4021 × 40 = 1600840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,

3540 = 35 × 2140 × 21 = 735840 - Add the two like fractions:

1600840 + 735840 = 1600 + 735840 = 2335840 - 2335/840 simplified gives 467168
- So, 40/21 + 35/40 = 467/168

In mixed form: 2131168

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