Add 90/40 and 42/28
1st number: 2 10/40, 2nd number: 1 14/28
90/40 + 42/28 is 15/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 28 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
90/40 = 90 × 7/40 × 7 = 630/280 - Likewise, for the 2nd fraction, since 28 × 10 = 280,
42/28 = 42 × 10/28 × 10 = 420/280 - Add the two like fractions:
630/280 + 420/280 = 630 + 420/280 = 1050/280 - 1050/280 simplified gives 15/4
- So, 90/40 + 42/28 = 15/4
In mixed form: 33/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40+84/28 90/80+42/28 90/40+42/56 90/40+42/84