Add 90/42 and 70/40
1st number: 2 6/42, 2nd number: 1 30/40
90/42 + 70/40 is 109/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
90/42 = 90 × 20/42 × 20 = 1800/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
70/40 = 70 × 21/40 × 21 = 1470/840 - Add the two like fractions:
1800/840 + 1470/840 = 1800 + 1470/840 = 3270/840 - 3270/840 simplified gives 109/28
- So, 90/42 + 70/40 = 109/28
In mixed form: 325/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84+70/40 90/42+70/80