HOMEWORK!! Help please?

Question

Hey.. okay in math class we have to subtracted fractions.. I can't remember how to do that !
I tryed it and i think i'm doing it right but i am not sure. Here are some questions answer the if you know how, and i'll check if i did it right. Thanks

1. 2 1/2-1 2/5=

2. 3 3/8-1 1/4=

3. 2 5/6-1 2/5=

Answer 1

You have to change the fractions in each equation to a common denominator. For example, in # 1 the lowest common denominator of 2 and 5 is 10, so you have to change each fraction to 10ths, which means you will have:

2 5/10 - 1 4/10 = 1 1/10 when you do the subtraction (2 - 1 = 1 and 5/10 - 4/10 = 1/10.

For #2 the lowest common denominator of 8 and 4 is 8, so you will have:

3 3/8 - 1 2/8 =

And for # 3 the lowest common denominator of 6 and 5 is 30, so you will have:

2 25/30 - 1 12/30 =

I hope this helps. Ask your teacher to explain it again if you don't understand how to get the LCD - lowest common denominator. Best of luck with it.

Answer 2

1. 1 1/10
2. 2 1/8
3. 1 13/30

First you make the numbers into fractions, like 2 1/2 is 5/2. Then you get a common denominator between the two fractions you are subtracting or adding. For example the common denominator of 5/2 and 7/5 is 10, so you would have 25/10 - 14/10. Then you subtract the numerators keeping the denominators the same, so 25/10 -14/10 = 11/10. Then simplify your answer, 11/10 = 1 1/10.

Answer 3

1
You need a common denominator (that is the number on the bottom of the fraction) so
2 1/2 = 5/2 = 25/10
1 2/5 = 7/5 = 14/10
so 25/10 - 14/10 = 11/10 = 1 1/10

2

3 3/8 = 27/8
1 1/4 = 5/4 = 10/8
27/8 - 10/8 = 17/8 =2 1/8

3
2 5/6 = 17/6 = 85/30
1 2/5 = 7/5 = 42/30
83/30 - 42/30 = 41/30 = 1 11/30

Answer 4

here's an example of how to do this. i'll give you the answer for number 1.

#1. first you find the lowest common denominator.

so, you have 2 and 5 as common denominators. so the lowest common denominator is 10.

#2. since there are two whole numbers for the first fraction, you get twenty. and then half of ten is 5. so all together you get twenty five. 25/10

and then you do the same for the other side.
14/10.

25/10 - 14/10 = 11/10

#3. then you have to switch it back to whole numbers and fractions and such.

1 1/10

#4. reduce.
since you cannot reduce the fraction in the equation above, you leave it as it is.

Answer 5

to subtract you have they have to have the same denominators...first make it an improper fraction, then determine a similar denominator (for #1 it would be 10), so just multiply top and bottoms by what it takes to get ten, then subtract, I will do the first one, then you're on your own:

2 1/2 - 1 2/5=

5/2 - 7/5=

(5/2) (5/5) - (7/5) (2/2) =

25/10 - 14/10 = 11/10 = 1 1/10

Answer 6

Ummm....I think the answer to number 1 is 1 1/10, #2 is 2 1/8, and #3 is 1 13/30?

Sorry, it's been so long I can't remember how to do them either. I think those are right, but I might be going about it wrong.

Good luck!

Answer 7

1. 1 1/10
2. 2 1/8
3. 1 13/30
you multiple the denominator to get common denominator
you have to multiple the top to but do not worry about the whole #

Answer 8

1. 1 1/10
2. 2 1/8
3. 1 13/30
am sure thats it :]

U just make all the bottom numbers the same by finding a common factor, then u can subtract them,

Answer 9

Use a calculator.
Turn the fractions into decimals by dividing the numerator by the denominator. And the whole number stays a whole number.

Answer 10

1. 1 1/10
2. 2 1/8
3. 1 13/30

I hope I am right :)