Add 90/40 and 30/42
1st number: 2 10/40, 2nd number: 30/42
90/40 + 30/42 is 83/28.
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,
30/42 = 30 × 20/42 × 20 = 600/840 - Add the two like fractions:
1890/840 + 600/840 = 1890 + 600/840 = 2490/840 - 2490/840 simplified gives 83/28
- So, 90/40 + 30/42 = 83/28
In mixed form: 227/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40+60/42 90/80+30/42 90/40+30/84 90/40+90/42