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How can you tell by looking at the numerator and the denominator if the fraction is greater than or less than one half?
Wiki User
∙ 13y ago
Find out what half the denominator is and then compare it to the numerator.
for example: for 4/7, 3.5 is half of 7 and 4 > 3.5, so 4/7 is greater than one half.
Wiki User
∙ 13y ago
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How do you find missing numerator or denominator?
If you have 2 fractions then you do cross multiplication where you take the left numerator and times it by the right denominator if your looking for the numerator. If your looking for the denominator then you do the same thing only you use the top as your divider not the bottom. Well if it is an equation with another fraction equaling it, you can multiply the denominator by a number that will allow it to have the same value of the denominator in the other fraction. Once you know that number ( the one it took so the denominators were equal when multiplied) you just divide the fraction ( the one you have both denominator and numerator) by that number, and put it over the original lone denominator, then you have your answer. If you only have the numerator you use pretty much the same concept except opposite the steps. Here's an example: 7/? = 21/30 You would know 7 multiplies with 3 to get 21, so you divide 30 by 3 (the number it took to get 7 to be 21), and you get 10. Then you put the 10 underneath the original 7/? resulting in the answer being 7/10. So 7/10=21/30. Hope this is the answer you were looking for.
What are the rules for ordering and comparing fractions?
help me plzplz plz plz plz i need the answer other people need the answer.Here are some rules for working with the same denominator or numerator...Rule #1When two fractions have the same denominator, the bigger fraction is the one with the bigger numerator.2/6 < 5/6 The size of the fraction is the same (sixths), the numerator is what is different (2 2/15.In this case you are looking at the same portion (numerator). This means you look at the denominator and find out which is larger or smaller. Remember the bigger the number the smaller it is.More Ordering and Comparing Advice.....1. Think of 1/2 and 1. If there are a set of fractions you can look to see which are less than half, a half, or close to 1.EX. 4/8, 1/3, 9/101/3 is less than half4/8 is half9/10 is almost 12. Use division. Compare 3/4 and 5/6. You can divide the numerator by the denominator. You will have numbers that are easier to compare3/4= .755/6= .83333/4 < 5/63. Use a picture or number line or fraction strips. It's pretty basic but if all else fails. Just make sure that the item (shape, or number line) is the same size/length and try to divide it as evenly as possible.4. Find a common denominator. By doing so you create an equivalent fraction (the same fraction with a different name).
How does cross multiplying of fractions work?
There are places where this term is used. 1st- to compare fractions across an equals you are multiplying each side by the product of the denominators. It looks like you multiply the numerator of the left side times the denominator of the right and put that product on the left side. Multiply the numerator of the left times the denominator of the right and put that on the right. In algebra this is good when looking for an unknown. 2nd- when comparing fractions to see which one is bigger you can multiply up from the denominator to the other numerator and compare these numbers to see which one is bigger.
What is two thirds of thirty nine?
The easiest way to solve this is to look at the denominator of 2/3 (which is 3). Divide the answer (39) by the denominator (3), which gives you (13). Since you are looking for "2" of the thirds, multiply the numerator (which is 2) by (13) and this gives you the answer (26).
How do you compare fractions in terms of similar and dissimilar fractions?
You can compare similar fractions by looking at their numerators. You can compare dissimilar fractions by converting them to similar fractions and looking at their numerators. You can convert a dissimilar fraction to a similar fraction by finding the least common denominator.
How can you tell just by looking that a fraction is less than or greater that a half?
If the numerator is greater than or less than one half of the denominator. For example, 7/16 is less because 7 is less than half of 16.
How do you find missing numerator or denominator?
If you have 2 fractions then you do cross multiplication where you take the left numerator and times it by the right denominator if your looking for the numerator. If your looking for the denominator then you do the same thing only you use the top as your divider not the bottom. Well if it is an equation with another fraction equaling it, you can multiply the denominator by a number that will allow it to have the same value of the denominator in the other fraction. Once you know that number ( the one it took so the denominators were equal when multiplied) you just divide the fraction ( the one you have both denominator and numerator) by that number, and put it over the original lone denominator, then you have your answer. If you only have the numerator you use pretty much the same concept except opposite the steps. Here's an example: 7/? = 21/30 You would know 7 multiplies with 3 to get 21, so you divide 30 by 3 (the number it took to get 7 to be 21), and you get 10. Then you put the 10 underneath the original 7/? resulting in the answer being 7/10. So 7/10=21/30. Hope this is the answer you were looking for.
How do you reduce 24 over 96?
When looking to see if a fraction can be reduced first you have to see if the numerator and denominator have any common factors. The greatest common factor of 24 and 96 is 24. So, if you want to reduce this fraction you simply divide the greatest common factor into both the numerator and the denominator. 24 over24= 1 (Which is your new numerator) 96 over 24= 4 (Which is your new denominator) So 24 over 96 can be reduced down to 1 over 4.
What type of fractions can you compare by looking at the numerator?
Only Fractions with a Common Denominator can be directly compared.
What fraction would be most likely estimated as one half?
Presumably you're looking at a list to choose from. Choose the one where the numerator is closest to half of the denominator, like 4/9, or 5/11.
How do you change a fraction till simplest form?
You search for any common denominator between the numerator (top) and the denominator (bottom). If the common factor is larger than 1, you divide both by that number. Then look again for a common denominator.You can avoid repeatedly looking for common denominators if you go for the greatest common denominator.
Why do you have to multiply or divide the numerator or denominator of the fraction to find an equivalent fraction?
Equivalent fraction have the same value. Any whole number divided by itself is one Multiplying any number by 1 results in the same number. Thus when you multiply the numerator and denominator of a fraction by the same number, it leaves the value of the fraction the same, but the numerator and denominator will be different, creating an equivalent fraction. For example if you have a pizza and cut it in half, and take one of those pieces you will have 1/2 of the pizza. However, if you now cut the half you have and the half left on the plate into half again (each piece will be exactly the same size, a quarter of the pizza), you will still have half the pizza, but it will be made up of 2 of the 4 pieces of the pizza - you will have 2/4 of the pizza; thus 1/2 and 2/4 are equivalent fractions. Now, looking at those fractions again, what happens if you multiply the 1/2 by 2/2 (which is the same as multiplying by 2 ÷ 2 = 1): 1/2 x 2/2 = (1x2)/(2x2) = 2/4 so 1/2 and 2/4 are equivalent fractions. When dividing the numerator and denominator by the same number, this is really the same, but just going from a fraction with large numerator and denominator to one with smaller numerator and denominator - the reverse of the example above (sticking the pieces of pizza together again).
How do you double a fraction?
well, you have to have a specific question to know how to answer that.NOW JUST SMILE PEOPLE
How can you tell which fraction is smaller by looking at their denominators?
You can't unless the numerators are equal. In that case, the fraction with the larger denominator is smaller.
Lowest common denominator for 13 and 20?
http://www.helpwithfractions.com/least-common-denominator.html The least common denominator is the bottom number of a fraction you have the Numerator ------------- Denominator If you are looking for the least common denominator you would simply find the least common multiple. This is made easy by http://www.analyzemath.com/Calculators_3/lowest_common_multiple.html Once you have found that you have the number that should be on the bottom then to make the fraction correct you would simply multiply the Numerator by the same amount you had to multiply the denominator to get that number. In the example of 2/4 and 5/8 the LCD and LCM is 8 so you would multiply 4 by 2 to get 8 then you would also multiply 2 by 2 to get 4 making the fractions now 4/8 and 5/8.
How do you set up a conversion to solve?
You could set up a proportion and cross multiply. Example: 1 Hour X Hours ------- = ------- 60 Min. 120 Min. 1 Hour is equal to the subunit of 60 Minutes. Use the same units in both denominators (bottom of fraction) and the same units in both numerators (top of fraction). Multiply the numerator of the first fraction with the denominator of the second and set it equal to the denominator of the first fraction multiplied by the numerator of the second fraction using a variable for the missing unit (which is probably the answer you're looking for). 120(1) = 60(X) Solve for 'X' to get the number of hours in 120 minutes. 120/60 = 2 The answer is 2 hours.
Why do you flip fractions when dividing fractions?
Flipped fractions are called reciprocals.We flip when we reposition a fraction from below the primary dividing line to above the primary, or vice versa, to simplify a calculation.Short answer: to simplify an expression that includes a fraction in its denominator or in its numerator.A flipped fraction is a shortcut version of a two step process of moving a fraction from a denominator to a numerator, or vice versa, to help us calculate the answer.To illustrate the long form of calculation :you can see that10 / 1/5 = 10 / 0.2 = 100 / 2 = 50Restating this example question to help you understand what is going on :10 x [ 1/ 1/5 ]which is merely separating the fraction in the denominator from the rest of the question by multiplying the fractional denominator [ alone ] by 1 or,more accurately, the whole expression given by 1/1. This has not changed the value of the final answer in any way.Let's make this very clear by considering ONLY the fractional denominator for a moment.1 / 1/5 times 1 / 1or1 x 1 / 1 x 1/5Now we can simplify this ugly-looking expression by relocating the lower level of denominator, the 5 , up to the primary numerator level, giving :[ ignoring the dots ]1 . 5_ x _ . which is simplified to : 5 / 1 or 51 . 1Now you already know that the final answer to the original question is 50or 10 x 5What we did there was MOVE the fraction in the denominator UP to the numerator without changing the overall value of the expression.We did that by reversing the fraction's numerator and denominator [ flipping both values ] when we repositioned the fraction up to the main numerator position.By it not changing the final answer when we did this, we have proven that the reciprocal of a fraction can replace [ or substitute for ] the fraction when the fraction is relocated above or below the primary dividing line, without affecting the final answer.Sounds confusing, doesn't it ?Just remember thatA over B/C is always equal to A x C/BC/B is called the reciprocal of B/Cand, of course, B/C can be termed the reciprocal of the fraction C/B.Dividing by a fraction is the same, mathematically, as multiplying by its reciprocal [flipping the fraction].There are perhaps two questions here:Why does it work?Why do we do it?I'll try to answer both questions:What you are really doing is multiplying the numerator and denominator by the same number (the flipped denominator). Multiplying this way does not change the value of the original problem by one of the rules of arithmetic (which we can prove). When you choose this flipped fraction to multiple by, you will see that it does something interesting to the denominator, mainly, it turns it into the value of one after you multiply and simplify. Since any number divided by 1 is itself, this simplifies the original fraction and turns the problem into the flipped fraction form.We do all this because the rule for multiplying fractions together is very simple: multiply the numerators together to get the numerator of the answer and multiply the denominators together to get the denominator of the answer.
