Add 90/70 and 20/40
1st number: 1 20/70, 2nd number: 20/40
90/70 + 20/40 is 25/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
90/70 = 90 × 4/70 × 4 = 360/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
20/40 = 20 × 7/40 × 7 = 140/280 - Add the two like fractions:
360/280 + 140/280 = 360 + 140/280 = 500/280 - 500/280 simplified gives 25/14
- So, 90/70 + 20/40 = 25/14
In mixed form: 111/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70+20/80 90/70+60/40