Add 84/80 and 72/63, Solve 1 4/80 + 1 9/63 as a fraction

Add 84/80 and 72/63

1^st number: 1 4/80, 2^nd number: 1 9/63

84/80 + 72/63 is 307/140.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 63 is 5040

Next, find the equivalent fraction of both fractional numbers with denominator 5040
For the 1st fraction, since 80 × 63 = 5040,
84/80 = 84 × 63/80 × 63 = 5292/5040
Likewise, for the 2nd fraction, since 63 × 80 = 5040,
72/63 = 72 × 80/63 × 80 = 5760/5040
Add the two like fractions:
5292/5040 + 5760/5040 = 5292 + 5760/5040 = 11052/5040
11052/5040 simplified gives 307/140
So, 84/80 + 72/63 = 307/140
In mixed form: 227/140

MathStep (Works offline)

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