You need to know the least common denominator (LCD) of 12 and 45 if you want to add or subtract two fractions with 12 and 45 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 12 and 45 is 180.
Here is a math problem example where you need to know the LCD of 12 and 45 to solve:
3/12 + 2/45 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
180/12 = 15
180/45 = 4
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 15 = 45
2 x 4 = 8
Step 3) Put it all together to solve the problem:
45/180 + 8/180 = 53/180
= 3/12 + 2/45 = 53/180
It's that easy! Once again, the lowest common denominator (LCD) of 12 and 45 is as follows:
180
Find Least Common Denominators
Enter another two numbers below to find the Least Common Denominator.