You need to know the least common denominator (LCD) of 10 and 7 if you want to add or subtract two fractions with 10 and 7 as denominators.
The least common denominator, also called lowest common denominator (LCD), of 10 and 7 is 70.
Here is a math problem example where you need to know the LCD of 10 and 7 to solve:
3/10 + 2/7 = ?
Step 1) Take the LCD and divide each denominator by it as follows:
70/10 = 7
70/7 = 10
Step 2) Multiply each nominator with the respective answers from Step 1:
3 x 7 = 21
2 x 10 = 20
Step 3) Put it all together to solve the problem:
21/70 + 20/70 = 41/70
= 3/10 + 2/7 = 41/70
It's that easy! Once again, the lowest common denominator (LCD) of 10 and 7 is as follows:
70
Find Least Common Denominators
Enter another two numbers below to find the Least Common Denominator.