math help!!?

Question

2 3/8 * 4 4/5
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7 1/3 * 10 11/12

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8 1/6 * 2 1/4

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1/4 * 5 2/5

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1 1/2 * 5 1/3

i dont know how yo use a calculator on fractions

ITS MULTIPLY!!!!!!!!!!!!


* = multiply

IM LIKE 14 CHECKING MY BOY TEST

Answer 1

That's the simple fraction. Read your textbook first.

Answer 2

An easy way to do fractions like this is to turn partial-fractions into a single fraction. Like 2 3/8. Change that to only /8ths. To do that you can multiply 2 by 8/8 [ After all, anything multiplied by 1 is itself, and 8/8 = 1]. That would get you 16/8. Then you simply add the 3/8 to it and get 19/8.

Do the same for the other side.
4 4/5 ->
4 * 5/5 + 4/5 ->
20/5 + 4/5 ->
24/5

When you multiply you just multiply the top numbers then the bottoms. So we changed it to 19/8 * 24/5. A helpful thing your teacher might have told you also is that you can lower the bigger number by cross-dividing - might not be the term he used, I haven't had math in years so bear with me. To do that you see if the numbers across from one another are divisible. In this example:

19/8 * 24/5

19 divided by 5 (the numbers across from each other) aren't going to give you a whole number, so its a no go. The 24 and 8 however are! So you can divide each by 8. 8/8 turns to 1 and 24/8 = 3. Now you have:

19/1 * 3/5

A lot easier numbers to work with. Now just multiply the tops together and then the bottoms.

19 *3 = 57 ; 1 * 5 = 5

Your answer would be 57/5, or 11.4 in decimal. If you need to to be partial fractions again you just see how many times 57 can be divided by 5. In this case it would be 11, because 11x5 = 55. Of course, that leaves you with 2 over. So you would have a final answer of 11 2/5 (Which if you check on a calculator is the same thing as 57/5 or 11.4).

That is just one answer but you do the others the same way. Hope that helps!

Answer 3

I'm only going to help you with the first one... if you don't learn how to do this, your next test is going to really suck!

First you need to make all the numbers into fractions, with no whole numbers by multiplying the whole number (2) by the bottom number of the fraction (8) and add the top number of the fraction (3) to make a new top number for the fraction:

2 3/8 = (2 x 8) + 3 = 16 + 3 = 19 which will be 19/8

4 4/5 = (4x5) +4 = 20 + 4 = 24 which will be 24/5

Then multiply the numbers straight across (top number x top number then bottom x bottom)
19/8 x 24/5 =
=(19 x 24) / (8 x 5)
=456 / 40

Then divide out the fraction to get a more comprehensible number (look for common denominators)

456 / 40
=11 16/40
= 11 2/5

Good luck

Answer 4

Change each fraction to an improper fraction (greater than 1).
For example,, multiplying 2/1 by 8/8 and adding the result to 3/8 gives

2 3/8 = 19/8. Or recall the shortcut: 8 x 2 + 3 over 8 = 19/8

So the first problem can be changed to

19/8 * 24/5

The 24 can be factored into 3*8 and the 8s canceled, then multiply the numerators, then the denominatros to get

19/8 * 3*8/5 = 19*3 / 5 = 57/5 = 11 2/5

Do the other problems the same way.

Answer 5

11 2/5
80 1/18
18 3/8
1 7/20
8

Answer 6

2 3/8 * 4 4/5
19/8 * 24/5
(19 * 24) /(8 * 5)
=(19*3)/5
=57/5
=11 2/5

7 1/3 * 10 11/12
22/3 *131/12
=(22*131) /(3*12)
=(11*131)/(3*6)
=1441/18
=80 1/18

8 1/6 * 2 1/4
49/6 * 9/4
(49*9)/(6*4)
=(49*3)(2*4)
=147/8
=18 3/8

1/4 *5 2/5
1/4 * 27/5
=27/20
=1 7/20

1 1/2 *5 1/3
3/2 * 16/3
=(3*16)/(3*2)
=16/2
=8

Answer 7

all are the same
convert to fractions

2 3/8 = 19/8
4 4/5 = 24/5
now multiply

19 * 24/ 8 * 5

you can 'cheat' by dividing 24 by 8
and 'reducing' the fraction early
so that the new formula is

19 * 3/5

multiply out and simplify

all the best

Answer 8

Convert the fractions to improper fractions (instead of 4 1/8; 33/8). Then convert the fractions to common denominators (denominator probably becomes least common multiple). How you do that; your guess is as good as mine; just give it a few whirls; it'll probably work. Finally, multiply numerators; then denominators. Have fun!

Answer 9

mixed fractions r pretty easy just take the fraction fro example 7 2/3 and do 2 divided by 3 and add the whole number

Answer 10

change them to mixed numbers then multiply across
19/8 * 24/5 = 456/40
reduce
456/40 = 57/5
change back to mixed number
11 2/5

Answer 11

Convert all of the compound numbers to improper fractions. Then just multiply them. Multiplication doesn't require common denominators.