Add 25/70 and 98/90, Solve 25/70 + 1 8/90 as a fraction

Add 25/70 and 98/90

1^st number: 25/70, 2^nd number: 1 8/90

25/70 + 98/90 is 911/630.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 90 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 70 × 9 = 630,
25/70 = 25 × 9/70 × 9 = 225/630
Likewise, for the 2nd fraction, since 90 × 7 = 630,
98/90 = 98 × 7/90 × 7 = 686/630
Add the two like fractions:
225/630 + 686/630 = 225 + 686/630 = 911/630
So, 25/70 + 98/90 = 911/630
In mixed form: 1281/630

MathStep (Works offline)

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