How can you use subtraction to describe division?

- anonymous

How can you use subtraction to describe division?

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- Falling_In_Katt

by "subtracting" or crossing out equal-size groups from the total in the visual model, until there is nothing left.

- Falling_In_Katt

Understand?

- anonymous

yes :) thanks ... can you help me with some more questions please? @Falling_In_Katt

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- Falling_In_Katt

I can try

- anonymous

Can you divide by zero? Why or why not?

- Falling_In_Katt

Division by zero is an operation for which you cannot find an answer, so it is disallowed. You can understand why if you think about how division and multiplication are related.
12 divided by 6 is 2 because
6 times 2 is 12
12 divided by 0 is x would mean that
0 times x = 12
But no value would work for x because 0 times any number is 0. So division by zero doesn't work.

- Falling_In_Katt

Understand?

- anonymous

yes next!

- Falling_In_Katt

I'll try

- Hero

@geny55, What do you understand now about division by zero that you didn't before?

- anonymous

i just didnt get why you coudnt divide by 0

- Falling_In_Katt

But what did you learn about why you can't divide by 0?

- anonymous

that it would be undefined :) and you cant do it because it would just give you 0

- anonymous

How do you change a rational number to a decimal? Can you give an example of each?

- Falling_In_Katt

I can tell you how. Then you try to make examples.

- Falling_In_Katt

Convert a rational number to a decimal using long division; know that the decimal form of a rational number terminates in 0s or eventually repeats.

- anonymous

so now i do the example?

- Falling_In_Katt

Try to do this
-Express 7 / 8 rational numbers to decimals form by long division method

- anonymous

ok

- Hero

@geny55 what does ''undefined" mean to you in terms of division by zero?

- anonymous

i got 1.14285714

- Falling_In_Katt

That's wrong. Here ill set the equation up for you.
\[7.000 \div 8\]

- anonymous

can i do 17 / 8 instead please

- Falling_In_Katt

You would get the wrong answer, you must use long division! Be sure to show your steps.

- texaschic101

if you have to show your work by using long division, then just using a calculator to do it will not work. However, you can use a calculator to check your answer

- anonymous

ok

- anonymous

so whats the problem again?

- Falling_In_Katt

Express 7 / 8 rational numbers to decimals form by long division method.

- texaschic101

do you know how to do long division geny ?

- anonymous

yes :)

- Falling_In_Katt

Set it up like
\[7.000\div8\]

- texaschic101

even when you have to add a decimal and zeros

- anonymous

yes

- texaschic101

its just simple division....if you know long division, then you already know this

- anonymous

|dw:1442849658998:dw|

- Falling_In_Katt

|dw:1442849773706:dw|

- texaschic101

you did 8/7 ,Geny

- anonymous

oh, whoops.. sorry

- texaschic101

its easy to get confused on that....the numerator is in the box, the denominator is what you are dividing by and is outside the box...understand ?

- anonymous

|dw:1442849967305:dw|

- texaschic101

correct.....so 7/8 as a decimal is 0.875

- anonymous

yes!

- texaschic101

nicely done :)

- anonymous

thanks i have somoe more questions :) please stay :)

- Falling_In_Katt

Okay

- anonymous

this is the last question :)
Explain how to write repeating decimals in proper form?

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