Add 7/40 and 24/21
1st number: 7/40, 2nd number: 1 3/21
7/40 + 24/21 is 369/280.
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,
7/40 = 7 × 21/40 × 21 = 147/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
24/21 = 24 × 40/21 × 40 = 960/840 - Add the two like fractions:
147/840 + 960/840 = 147 + 960/840 = 1107/840 - 1107/840 simplified gives 369/280
- So, 7/40 + 24/21 = 369/280
In mixed form: 189/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/40+24/21 7/40+48/21 7/80+24/21 7/40+24/42 21/40+24/21 7/40+72/21 7/40+24/63 35/40+24/21 49/40+24/21