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Let's do an example:
5/6 - 3/4 = ?
To find this you must first get both fractions to have the same denominator, or the number on the bottom. This is accomplished my cross multiplication. Multiply the bottom number of the second fraction by the top number of the first; likewise with the other set.
5 x 4=20 and 6x3=18
Now multiply the two bottom numbers by each other.
6 x 4 = 24
This number will be the new denominator.
20/24 - 18/24 = ?
Now subtract like normal!
= 2/24 = 1/12
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∙ 14y ago
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Do you add and subtract like and unlike fractions in the same way?
no, to add and subtract like and unlike fractions the denominator has to be the same,
When do you use LCM in math?
When you want to add or subtract unlike fractions.
How do you add and subtract dissimilar fractions?
Make the fractions equivalent then subtract
How do you add or subtract fractions with unlike denominators?
convert at least one of them so that they have the same denominator, then proceed with the addition or subtraction
How do you add two fractions that have like denominators?
In fractions, you can NEVER add or subtract
Do you add and subtract like and unlike fractions in the same way?
no, to add and subtract like and unlike fractions the denominator has to be the same,
When you add or subtract fractions with unlike denominators why do you have to find LCM?
Because to add fractions, the denominators must be equal.
What is a situation where you would use LCM?
To add and subtract unlike fractions.
When do you use LCM in math?
When you want to add or subtract unlike fractions.
What problems can be solved using gcf and LCM?
Finding the LCM will make adding and subtracting fractions easier.
Why do you have to turn unlike fractions into like fractions to add or subtract?
because its just one of the rules of math :)
Why do you need to use common denominator?
To get the right answer when you add or subtract unlike fractions.
How do you add and subtract unlike positive and negative fractions?
-1/2+7/10
Why is it important to find the LCM of 2 numbers?
It will help when you want to add and subtract unlike fractions.
How do you add and subtract fractions with the same denominator?
it stay the same when you subtract fractions and when you add fractions.
Why do fractions need to have unlike denominator before you add or subtract them?
The question is based on a complete misunderstanding of what is required. Unlike denominators are NOT required!
How do GCF and LCM involve with the real world?
Use the GCF to reduce fractions. Use the LCM to add and subtract unlike fractions. Carpenters work with fractions a lot.
