Add 90/40 and 20/42
1st number: 2 10/40, 2nd number: 20/42
90/40 + 20/42 is 229/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
90/40 = 90 × 21/40 × 21 = 1890/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
20/42 = 20 × 20/42 × 20 = 400/840 - Add the two like fractions:
1890/840 + 400/840 = 1890 + 400/840 = 2290/840 - 2290/840 simplified gives 229/84
- So, 90/40 + 20/42 = 229/84
In mixed form: 261/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40+40/42 90/80+20/42 90/40+20/84 90/40+60/42