Add 21/49 and 40/90
21/49 + 40/90 is 55/63.
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,
21/49 = 21 × 90/49 × 90 = 1890/4410 - Likewise, for the 2nd fraction, since 90 × 49 = 4410,
40/90 = 40 × 49/90 × 49 = 1960/4410 - Add the two like fractions:
1890/4410 + 1960/4410 = 1890 + 1960/4410 = 3850/4410 - 3850/4410 simplified gives 55/63
- So, 21/49 + 40/90 = 55/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/49+40/90 21/49+80/90 21/98+40/90 63/49+40/90