Add 81/60 and 45/35, Solve 1 21/60 + 1 10/35 as a fraction

Add 81/60 and 45/35

1^st number: 1 21/60, 2^nd number: 1 10/35

81/60 + 45/35 is 369/140.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 35 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 60 × 7 = 420,
81/60 = 81 × 7/60 × 7 = 567/420
Likewise, for the 2nd fraction, since 35 × 12 = 420,
45/35 = 45 × 12/35 × 12 = 540/420
Add the two like fractions:
567/420 + 540/420 = 567 + 540/420 = 1107/420
1107/420 simplified gives 369/140
So, 81/60 + 45/35 = 369/140
In mixed form: 289/140

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