Add 42/49 and 20/90
42/49 + 20/90 is 68/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 90 is 4410
Next, find the equivalent fraction of both fractional numbers with denominator 4410 - For the 1st fraction, since 49 × 90 = 4410,
42/49 = 42 × 90/49 × 90 = 3780/4410 - Likewise, for the 2nd fraction, since 90 × 49 = 4410,
20/90 = 20 × 49/90 × 49 = 980/4410 - Add the two like fractions:
3780/4410 + 980/4410 = 3780 + 980/4410 = 4760/4410 - 4760/4410 simplified gives 68/63
- So, 42/49 + 20/90 = 68/63
In mixed form: 15/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/49+20/90 42/49+40/90 42/98+20/90 42/49+60/90