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Fractions can be added and subtracted only if they're what fractions?
Wiki User
∙ 15y ago
like, common denominator
Wiki User
∙ 15y ago
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Why do you convert unlike fractions?
Unlike fractions have denominators that are unequal, and therefore cannot be added or subtracted. If two fractions need to be added or subtracted they must first be converted to like fractions.
Adding and subtracting unlike denominators?
Fractions can only be added or subtracted if the denominators are the same. If the denominators are different, then the fractions need to be made into equivalent fractions with the same denominator. The new denominator can be found simply by multiplying the denominators together, but this can lead to some large fractions with which to work. A better new denominator is the lowest common multiple of (all the) denominators. (Once the new denominator is found, the fractions' new numerators are found by multiplying their current numerator by the new denominator divided by their current denominator to make their equivalent fractions with the new denominator.) Once all the fractions are converted into equivalent fractions with the new denominator then the fractions can be added or subtracted, with the result being simplified (if possible).
When you add or subtract fractions why doesn't the denominator change?
Because the denominator does not express a value, only the size of the parts being added or subtracted. You can think of integers as fractions with a denominator of 1. At any rate, 1/3 plus 1/3 = 2/3, as you can see with any sliced pizza. When you multiply fractions, the denominator is telling you to change the size of those parts, so that 1/2 of 1/3 is 1/6.
What is A third plus three fifths?
To add/subtract fractions, the denominators (bottom numbers) must be equal; so first convert the fractions into equivalent fractions with the same denominator. Then the numerators (top numbers) are added/subtracted and the resulting fraction simplified: 1/3 + 3/5 = (1×5)/(3×5) + (3×3)/(5×3) = 5/15 + 9/15 = (5+9)/15 = 14/15
Which is larger two fifths or three fifths?
Three fifths.Any time you are dealing with like fractions (that is, the bottom number, or denominator, is the same) then the numerator (top number) will determine which is larger, since you are dealing with pieces of the same size. For example, 3/12 is smaller than 9/12, and 7/8 is larger than 3/8.The only time there is really a question of which is larger or smaller is when you are dealing with unlike fractions, which then must be converted to like fractions and thus the comparison becomes clear. For example, "Which is larger, 3/4 or 3/6?" At a glance you should be able to tell that 3/4 is larger, since in this case we are dealing with the same number of pieces, but fourths are larger (in fractions, the larger the denominator, the smaller the piece). However, technically these should be converted to like fractions. Since 12 is the Least Common Denominator between these two fractions, we would convert both to twelfths: 3/4 = 9/12 and 3/6 = 6/12. So now the question becomes, "Which is larger, 9/12 or 6/12?" which can be easily answered -- 9/12 or (in lowest terms) 3/4.* The bottom number of a fraction is called a denominator. It denotes how many pieces into which the whole has been divided (thus the more pieces, the smaller each piece). * The top number of a fraction is called the numerator. It denotes how many pieces of the whole you have.* Like fractions have the same denominator. They can easily be compared, added or subtracted as is (you add or subtract only the numerators). * Unlike fractions (where the denominator is different) must be converted into like fractions (using the Least Common Denominator) and then can be added, subtracted or compared easily. (Although they can be multiplied or divided without conversion.)
Fractions can be added and subtracted only if they're fractions?
We can only add or subtract fractions if they have the same denominators
Why do you convert unlike fractions?
Unlike fractions have denominators that are unequal, and therefore cannot be added or subtracted. If two fractions need to be added or subtracted they must first be converted to like fractions.
What is the definition of unlike fractions?
That simply means that the fractions have different denominators. Such fractions cannot be directly added, subtracted, or compared; you have to convert them to a common denominator first.
What is the requirement to add or to subtract fractions?
The denominator (bottom number) must be the same for all the fractions being added or subtracted together.
What happens when you have two fractions that have the same denominator?
Nothing actually happens. You are now in a position where the fractions may be added or subtracted more easily but that is all.
LCD of two or more fractions mean?
LCD is the Lowest Common Denominator which is the lowest number into which the denominators of all the fractions will each divide exactly. Each of the fractions can then be converted to an equivalent fraction with the new denominator which then allows the fractions to be added and/or subtracted.
Why can't fractions with two different denominators be added or subtracted?
Because God made it so O.o
Adding and subtracting unlike denominators?
Fractions can only be added or subtracted if the denominators are the same. If the denominators are different, then the fractions need to be made into equivalent fractions with the same denominator. The new denominator can be found simply by multiplying the denominators together, but this can lead to some large fractions with which to work. A better new denominator is the lowest common multiple of (all the) denominators. (Once the new denominator is found, the fractions' new numerators are found by multiplying their current numerator by the new denominator divided by their current denominator to make their equivalent fractions with the new denominator.) Once all the fractions are converted into equivalent fractions with the new denominator then the fractions can be added or subtracted, with the result being simplified (if possible).
How do you change fractions into like terms?
When the denominators of two or more fractions are the SAME, then they can be added or subtracted directly. An easy way is to multiply each denominator by the other (along with its corresponding numerator).
Fraction and mix numbers?
Fractions and mixed numbers are numbers that can be added, multiplied, divided and subtracted. This is taught in math.
How do you find LCD in fraction?
By finding the lowest common multiple of the fractions with different denomiators that need to be added or subtracted
Do you ever have to simplify if you find the LCD when subtracting fractions?
No because in order to subtract or add fractions the denominator of the fractions must be the same and if they are not then the lowest common denominator of the fractions must be found. Having subtracted or added the fractions then it may be possible to simplify the result.
