Add 21/45 and 5/40
21/45 + 5/40 is 71/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 45 × 8 = 360,
21/45 = 21 × 8/45 × 8 = 168/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
5/40 = 5 × 9/40 × 9 = 45/360 - Add the two like fractions:
168/360 + 45/360 = 168 + 45/360 = 213/360 - 213/360 simplified gives 71/120
- So, 21/45 + 5/40 = 71/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+5/40 21/45+10/40 21/90+5/40 21/45+5/80 63/45+5/40 21/45+15/40 21/45+25/40 21/45+35/40