Add 45/63 and 35/80, Solve 45/63 + 35/80 as a fraction

Add 45/63 and 35/80

45/63 + 35/80 is 129/112.

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

Next, find the equivalent fraction of both fractional numbers with denominator 5040
For the 1st fraction, since 63 × 80 = 5040,
45/63 = 45 × 80/63 × 80 = 3600/5040
Likewise, for the 2nd fraction, since 80 × 63 = 5040,
35/80 = 35 × 63/80 × 63 = 2205/5040
Add the two like fractions:
3600/5040 + 2205/5040 = 3600 + 2205/5040 = 5805/5040
5805/5040 simplified gives 129/112
So, 45/63 + 35/80 = 129/112
In mixed form: 117/112

MathStep (Works offline)

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