Add 4/10 and 21/40
4/10 + 21/40 is 37/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 10 × 4 = 40,
4/10 = 4 × 4/10 × 4 = 16/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
21/40 = 21 × 1/40 × 1 = 21/40 - Add the two like fractions:
16/40 + 21/40 = 16 + 21/40 = 37/40 - So, 4/10 + 21/40 = 37/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/10+21/40 4/10+42/40 4/20+21/40 4/10+21/80 12/10+21/40 4/10+63/40 4/30+21/40 20/10+21/40 4/50+21/40 28/10+21/40 4/70+21/40