How Do You Subtract Fractions with Different Denominators?

These fractions all have different denominators, and that means we can't just subtract the numerators!
We need to get a common denominator for each fraction
Once each fraction has the same denominator, we can combine all the numerators together in one fraction

1. The denominator is the number below the fraction bar
2. These fractions all have different denominators, and that means we can't just subtract the numerators!
1. LCD stands for Least Common Denominator
1. LCD stands for Least Common Denominator
1. LCD stands for Least Common Denominator
1. You can always multiply a number by 1 without changing the number. That's why 1 is called a multiplicative identity!
2. 3 divided by 3 is one!
1. You can always multiply a number by 1 without changing the number. That's why 1 is called a multiplicative identity!
2. 6 divided by 6 is one!
1. You can always multiply a number by 1 without changing the number. That's why 1 is called a multiplicative identity!
2. 4 divided by 4 is one!
1. The denominator is the number below the fraction bar
1. To get the answer, multiply the numerators together and multiply the denominators together
1. To get the answer, multiply the numerators together and multiply the denominators together
1. To get the answer, multiply the numerators together and multiply the denominators together
1. The numerator is the number above the fraction bar
2. The denominator is the number below the fraction bar
1. To find 3 - 6 - 8, we split the difference into two parts
2. First, we subtract 6 from 3
3. Second we subtract 8 from -3
1. Remember, you have to first get a common denominator for each fraction, and then you can combine the numerators!

Subtract the following fractions:1/8-1/4-2/6