Add 80/60 and 45/70, Solve 1 20/60 + 45/70 as a fraction

Add 80/60 and 45/70

1^st number: 1 20/60, 2^nd number: 45/70

80/60 + 45/70 is 83/42.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 70 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 60 × 7 = 420,
80/60 = 80 × 7/60 × 7 = 560/420
Likewise, for the 2nd fraction, since 70 × 6 = 420,
45/70 = 45 × 6/70 × 6 = 270/420
Add the two like fractions:
560/420 + 270/420 = 560 + 270/420 = 830/420
830/420 simplified gives 83/42
So, 80/60 + 45/70 = 83/42
In mixed form: 141/42

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