How can you use subtraction to describe division?

Question

falling_in_katt · Answer

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

falling_in_katt · Answer

Understand?

anonymous · Answer

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

falling_in_katt · Answer

I can try

anonymous · Answer

Can you divide by zero? Why or why not?

falling_in_katt · Answer

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 · Answer

Understand?

anonymous · Answer

yes next!

falling_in_katt · Answer

I'll try

hero · Answer

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

anonymous · Answer

i just didnt get why you coudnt divide by 0

falling_in_katt · Answer

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

anonymous · Answer

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

anonymous · Answer

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

falling_in_katt · Answer

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

falling_in_katt · Answer

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 · Answer

so now i do the example?

falling_in_katt · Answer

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

anonymous · Answer

ok

hero · Answer

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

anonymous · Answer

i got 1.14285714

falling_in_katt · Answer

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

anonymous · Answer

can i do 17  /  8 instead please

falling_in_katt · Answer

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

texaschic101 · Answer

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 · Answer

ok

anonymous · Answer

so whats the problem again?

falling_in_katt · Answer

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

texaschic101 · Answer

do you know how to do long division geny ?

anonymous · Answer

yes :)

falling_in_katt · Answer

Set it up like 
$$7.000\div8$$

texaschic101 · Answer

even when you have to add a decimal and zeros

anonymous · Answer

yes

texaschic101 · Answer

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

anonymous · Answer

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