Add 10/40 and 4/21
10/40 + 4/21 is 37/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
10/40 = 10 × 21/40 × 21 = 210/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
4/21 = 4 × 40/21 × 40 = 160/840 - Add the two like fractions:
210/840 + 160/840 = 210 + 160/840 = 370/840 - 370/840 simplified gives 37/84
- So, 10/40 + 4/21 = 37/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40+4/21 10/40+8/21 10/80+4/21 10/40+4/42 30/40+4/21 10/40+12/21 10/40+4/63 50/40+4/21 10/40+20/21 70/40+4/21 10/40+28/21