Add 9/40 and 10/42
9/40 + 10/42 is 389/840.
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,
10/42 = 10 × 20/42 × 20 = 200/840 - Add the two like fractions:
189/840 + 200/840 = 189 + 200/840 = 389/840 - So, 9/40 + 10/42 = 389/840
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/40+10/42 9/40+20/42 9/80+10/42 9/40+10/84 27/40+10/42 9/40+30/42 45/40+10/42 9/40+50/42 63/40+10/42 9/40+70/42