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# Why do you have to find a common denominator?

Updated: 4/28/2022

Wiki User

9y ago

Best Answer

Addition or subtraction of fractions require "like" fractions: that is, fractions with the same denominator.

Wiki User

6y ago
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Q: Why do you have to find a common denominator?
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### How do you keep the denominator the same?

you find the common denominator

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### Is it always necessary to find the least common denominator to compare the sizes of fractions?

When comparing fractions you must find a common denominator; by finding the least common denominator it will keep the numbers (numerators and denominator) smaller .

### How do you add improper fractions if the denominator can't multiply into the other denominator?

You Ned to find a larger common denominator or multiply the denominators to gain a common denominator.

### What is the least common denominator of 9?

You need at least two numbers to find a common denominator.

### Where is a denominator used?

Many places, but a common one is in adding fractions where we find a common denominator.

### What is the common denominator for 1734 and 15?

You can always find a common denominator by multiplying the denominators together.

No.

### What goes into 4 and 7 to find a common denominator?

To find a common denominator, it's what 4 and 7 go into, and that's 28.

### Does NINETY have a common denominator?

You need at least two numbers to find something in common. 90 can be a common denominator of other numbers, but it can't have a common denominator all by itself.

### Do you have to find the lcd when comparing them or can you use any common denominator?

For the sake of comparison, any common denominator will do.

### What is the largest common denominator of 20 and 15?

The is no "largest" common denominator. For any denominator you find, we can multiply it by a natural number and come up with a larger one. Do you mean LEAST COMMON DENOMINATOR?