Add 63/42 and 1/20, Solve 1 21/42 + 1/20 as a fraction

Add 63/42 and 1/20

1^st number: 1 21/42, 2^nd number: 1/20

63/42 + 1/20 is 31/20.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 42 × 10 = 420,
63/42 = 63 × 10/42 × 10 = 630/420
Likewise, for the 2nd fraction, since 20 × 21 = 420,
1/20 = 1 × 21/20 × 21 = 21/420
Add the two like fractions:
630/420 + 21/420 = 630 + 21/420 = 651/420
651/420 simplified gives 31/20
So, 63/42 + 1/20 = 31/20
In mixed form: 111/20

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