Add 21/60 and 25/7, Solve 21/60 + 3 4/7 as a fraction

Add 21/60 and 25/7

1^st number: 21/60, 2^nd number: 3 4/7

21/60 + 25/7 is 549/140.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 7 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 60 × 7 = 420,
21/60 = 21 × 7/60 × 7 = 147/420
Likewise, for the 2nd fraction, since 7 × 60 = 420,
25/7 = 25 × 60/7 × 60 = 1500/420
Add the two like fractions:
147/420 + 1500/420 = 147 + 1500/420 = 1647/420
1647/420 simplified gives 549/140
So, 21/60 + 25/7 = 549/140
In mixed form: 3129/140

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