You need to know the least common denominator (LCD) of 40 and 3 if you want to add or subtract two fractions with 40 and 3 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 40 and 3 is 120.
Here is a math problem example where you need to know the LCD of 40 and 3 to solve:
3/40 + 2/3 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
120/40 = 3
120/3 = 40
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 3 = 9
2 x 40 = 80
Step 3) Put it all together to solve the problem:
9/120 + 80/120 = 89/120
= 3/40 + 2/3 = 89/120
It's that easy! Once again, the lowest common denominator (LCD) of 40 and 3 is as follows:
120
Find Least Common Denominators
Enter another two numbers below to find the Least Common Denominator.