Add 81/4 and 25/28, Solve 20 1/4 + 25/28 as a fraction

Add 81/4 and 25/28

1^st number: 20 1/4, 2^nd number: 25/28

81/4 + 25/28 is 148/7.

Find the least common denominator or LCM of the two denominators:
LCM of 4 and 28 is 28

Next, find the equivalent fraction of both fractional numbers with denominator 28
For the 1st fraction, since 4 × 7 = 28,
81/4 = 81 × 7/4 × 7 = 567/28
Likewise, for the 2nd fraction, since 28 × 1 = 28,
25/28 = 25 × 1/28 × 1 = 25/28
Add the two like fractions:
567/28 + 25/28 = 567 + 25/28 = 592/28
592/28 simplified gives 148/7
So, 81/4 + 25/28 = 148/7
In mixed form: 211/7

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad