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Why when you add or subtract a fraction the denominator stays the same?
Wiki User
∙ 10y ago
When you add three of something to four of something, you get seven of something. It doesn't matter what the somethings are. Think of ninths as somethings. If you add three ninths and four ninths, you have to wind up with seven ninths. You can't wind up with seven eighteenths, because you weren't adding eighteenths to begin with.
Wiki User
∙ 10y ago
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How to subtract a fraction from a whole number?
Change the whole number into an improper fraction with the same denominator as the fraction and then subtract accordingly
How is subtracting fraction when numerator and denominator is the same?
If the numerator and denominator are the same, the fraction simplifies to 1. And you should be able to subtract 1!
How do you subtract mixed fractions when they have the same denominator?
The numerator of the answer is the result of subtracting the numerators of the fractions, and the denominator of the fraction is the same as the common denominator.
When adding or subtracting fractions do you change the numerator?
you subtract the numerator but the denominator stays the same.
When you add or subtract fractions with the same denominators what happens to the denominator in your answer?
It stays the same. Only the numerators change.
How do you subtract fractions without mixed numbers?
First, turn the fraction into a improper fraction. Then find a common denominator between the two numbers. After this, subtract strait across, but leave the denominator the same.
Can you subtract a fraction with the same denomintor and get a different denominator?
Only after simplification. If you subtract numbers with the same denominator, you have to put the original denominator in the result, but you can later simplify this, in some cases. A simple example: 3/4 - 1/4 = 2/4. Same denominator, but this can be simplified to 1/2.
How do you write a mixed number to a fraction?
You multiply the denominator by the whole number, then add the numerator of the original fraction to get the numerator of your new fraction. The denominator stays the same as the original. Then you simplify into lowest terms.
What happens to the size of the fraction when the numerator stays the same but the denominator increases?
The fraction decreases. 1/3 is smaller than 1/2.
Why is it easy to subtract and add with the fraction that has the same donominator?
When adding or subtracting fractions with the same denominator, it is easier because we can simply add or subtract the numerators and keep the denominator the same. The denominators are already equal, so no additional calculations or adjustments are necessary. This simplifies the math and makes it easier to compute the result.
When you subtract fractions do you subtract the denominator?
No. If the denominators are the same, you subtract the numerators. If the denominators are different you have to find the least common denominator.
How does the value of a fraction change if you double the denominator?
If you double the denominator of any fraction, the number of unit fractions stays the same but each unit fraction is half as big. So the value of the fraction is half what it was when you double the denominator. 2×(5/8)=(2×5)/8=10/8
