Add 9/40 and 90/42
1st number: 9/40, 2nd number: 2 6/42
9/40 + 90/42 is 663/280.
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,
9/40 = 9 × 21/40 × 21 = 189/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
90/42 = 90 × 20/42 × 20 = 1800/840 - Add the two like fractions:
189/840 + 1800/840 = 189 + 1800/840 = 1989/840 - 1989/840 simplified gives 663/280
- So, 9/40 + 90/42 = 663/280
In mixed form: 2103/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/40+90/42 9/80+90/42 9/40+90/84 27/40+90/42 45/40+90/42 63/40+90/42