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Math Help - Counting back change?

  1. #1
    Newbie MoneyStudent's Avatar
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    Counting back change?

    Okay, it's been a while since I've done simple subtraction, so I've forgotten the rule about subtracting from zero and watnot. Anyway, that's just the simple problem.

    Here's the real issue: I had an interview for a job that requires me to count back change (because they DON'T use cash registers, Bruster's IceCream). So I have 1 day to tighten up to go back to take a test. After coming home to practice, I've found out that today that I'm pretty dumb

    Anyway, I understand the general concept of counting back change. However, I don't know the steps to actually perform this task.

    Can anybody help me? Explanations... Exercises... anything?

    Keep in mind, I'm pretty dumb xD

    If customer pays 50.00 and it costs $44.03. The change is $5.97 (I used calculator). How am I supposed to count that back? Any tips on what I'm supposed to do to get the exact change?

    For example though, the realistic prices are like... $2.71 and $3.99
    Random tidbit, tax is 6% where I live... If anybody wants to know xD

    I think this is an article that explains what I'm supposed to be doing, I just don't really get it xD
    http://www.ehow.com/how_2265850_count-out-change.html
    Last edited by MoneyStudent; April 4th 2009 at 01:09 PM.
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  2. #2
    Newbie MoneyStudent's Avatar
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    Okay, so I did some practicing.

    Here's my excercise.

    Amount Paid: 20.00
    Total Cost: 2.71
    Customer's Change: 17.21

    The subtraction goes like this I guess

    20.00
    -2.71
    ______
    17.29

    The first 0 on the far right becomes a 10.
    The second 0 second from the far right becomes a 9.
    The third 0 from the right becomes a 9 as well.
    The 2 on the left becomes a 1.

    Now I was counting back.

    I counted back 4 pennies, 1 nickle, 2 dimes... I guess that gives a dollar? I know it gets sums up the ".00" in the "20.00" xD
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  3. #3
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    e^(i*pi)'s Avatar
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    Quote Originally Posted by MoneyStudent View Post
    Okay, so I did some practicing.

    Here's my excercise.

    Amount Paid: 20.00
    Total Cost: 2.71
    Customer's Change: 17.21

    The subtraction goes like this I guess

    20.00
    -2.71
    ______
    17.29

    The first 0 on the far right becomes a 10.
    The second 0 second from the far right becomes a 9.
    The third 0 from the right becomes a 9 as well.
    The 2 on the left becomes a 1.

    Now I was counting back.

    I counted back 4 pennies, 1 nickle, 2 dimes... I guess that gives a dollar? I know it gets sums up the ".00" in the "20.00" xD
    I usually add up to the next pound and then add the rest of the whole pounds and then if necessary some odd pence:

    for example paying 3 for a 1.89 item would be 11p to 2 and then 1 to 3 giving a total of 1.11
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  4. #4
    MHF Contributor
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    Quote Originally Posted by MoneyStudent View Post
    If customer pays 50.00 and it costs $44.03. The change is $5.97 (I used calculator). How am I supposed to count that back?
    Just do exactly what the term says: Count it out:

    44.03,
    plus two pennies is 44.05,
    plus two dimes is 44.25,
    plus three quarters is 45.00,
    plus five dollars is 50

    You never actually know how much change you've given; you never actually do any subtraction. You simply add from the total until you arrive at what the customer handed you.

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  5. #5
    Newbie MoneyStudent's Avatar
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    Columbus, GA
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    WOAH! I GOT IT!!


    You don't need to know the total change.

    Customer pays: 20.00
    Total price: 17.14

    You just add up to 20.00 from the 17.14.

    So from the (.14)
    Add 1 Penny to get (17.15)
    Add a dime to get .25 in the (17.25)
    Add 3 Quarters to sum up to (18.00)
    Add 2 dollars to sum up to (20.00)

    That money you just added up *IS* the change you're handing back.

    1 Penny, 1 Dime, 3 quarters, 2 Dollars
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  6. #6
    MHF Contributor
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    Quote Originally Posted by MoneyStudent View Post
    That money you just added up *IS* the change you're handing back.
    You got it!
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