Is there an easy way to do those coin problems for QR?

[virtualmaster999]

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Hey everyone!

I always get stuck on the coin problems (how many nickels if sally has x amount of .....yeah those ones)

I know you can use systems, but I feel lit takes too long. Guess and check isn't the fastest either.

Suggestions?

 

[Incis0r]

I would be interested in an answer to this as well!

 

[Lnguyen7]

Do you have a specific problem? Is this about conversion or probability?

 

[virtualmaster999]

Do you have a specific problem? Is this about conversion or probability?

Nothing specific; its not probability, just the ones where you have to determine the number of quarters, dimes, nickels that equal the total cost. These problems have come up quite frequently.

 

[alexis2010]

It usually turns out to be 2 equations with 2 unknowns or 3 equations with 3 unknowns if you have dimes nickels and quarters.
if you post a specific problem, it would be more helpful.

 

[virtualmaster999]

It usually turns out to be 2 equations with 2 unknowns or 3 equations with 3 unknowns if you have dimes nickels and quarters.
if you post a specific problem, it would be more helpful.

Sure thing, i'll try to post one tomorrow.

 

[PocketRocket]

Unfortunately, the best way to go about these problems is setting up 2 equations. Yes, you can reason it out and cancel some of the answer choices out by, for example, knowing that the answer can't be an odd #. But I personally liked to stick to one way of solving each type of problem so that, come test day, I was pretty much on autopilot lol.

 

[DentalGirl5]

Set up two equations that are in this style:
1) N+D = 15 [this equation adds up the amount of each coin...meaning there are 15 coins total]
2) 5N + 10D = X cents [this equation accounts for the value of the coins...and they equal to a certain amount of cents stated in the problem]
Then just solve for the variables!

 

[skyguy1]

honestly i go straight to the answers and figure it out that way... throw a question and ill try n help you show how i do it