Add 90/70 and 7/40
1st number: 1 20/70, 2nd number: 7/40
90/70 + 7/40 is 409/280.
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,
7/40 = 7 × 7/40 × 7 = 49/280 - Add the two like fractions:
360/280 + 49/280 = 360 + 49/280 = 409/280 - So, 90/70 + 7/40 = 409/280
In mixed form: 1129/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70+14/40 90/70+7/80 90/70+21/40 90/70+35/40 90/70+49/40