Monday, October 12, 2009

Jennifer's Scribepost Coin Math Oct 12,2009

Hello Everyone! Mr. Harbeck told us that we have to answer two questions in the slide and we have to answer this question also. Which is "How Many Coins Are There In The Jar?" That's All we have to do

1.If you put one coin in each day... how long would it take until the jar is full?

Well In A Year there is 365 days (366 For a leap year) Judging By the Picture, if 365 coins were in the jar, it would fill at least about 25% Of the Jar. So I think it would take like around 3 years and a few months until the jar is completely full.

2. If you were to separate the coins into groups, Which group has the most coin or the highest value?

If I did separate the coins into groups, I would think the pennies would have the most coins. Because, if you see the jar picture, pretty much you can see mostly pennies inside there. All The silver stuff are dimes,quarters, or nickels.

Now It's time For the Question That Mr.Harbeck Have Assigned Us.

How Many Coins are There In A Jar?

Before I Answer the question, there are the few hints that Mr. Harbeck gave us.

1. There are a hundred dollars in the jar.

2. It is American Money. Not Canadian money.

3. They were in rolls before it was in the jar.

First of all, I need to find out how much money of each roll is worth.
When I google it up about the money rolls, it said that 50 Pennies are worth 50 cents per roll, 40 Nickels in a roll are worth two dollars, 50 dimes are worth $5.00 in a roll, and 40 Quarters are worth Ten dollars in a roll.

What I did first is that I add all the rolls up it was $17.50. We have to make one hundred dollars. So If I have added, a roll of penny and a roll of a nickel, That would make Twenty dollars! So I have used two rolls of pennies, two rolls or nickels, one roll of dimes, and one roll of quarters. So if I repeat the process, it would be a hundred of dollars! So that means that I have used Ten rolls of pennies, 10 rolls of Nickels, 5 Rolls Of Dimes, and 5 Rolls of Quarters.

Now I need to find out how many coins are there.

Pennies, I times the amount of rolls by 50 which makes 500 coins
Nickels, I times the number of rolls by 40 which makes 400 coins
Dimes, I times the amount of rolls by 50 which makes 250 coins
Quarters, I times the number of rolls by 40 which makes 200 coins

So if I add them all up, it would make 1350 coins.

My Conclusion is that the amount of coins are inside the jar was 1350 coins.

Part 2 In Coin Math.

In Math Class Today, Mr.Harbeck told us that we have to answer a few math problems .

1. How full is the Canadian jar?
Well now that we know that there is 1280 coins in the American money, that is about 910 more than the Canadian money. So in this picture below me, will show you that the Canadian Jar is about 1/4 of the jar and the American jar is about 3/4 of the jar. But I know that you can divide the 1280 by 320 which that equals four. So I'm thinking that the jar maybe around between 25% to 30%.

2. How long would it take to fill the if you put in a coin each day? You Start on January 1, 2010.
Well.. If you do just pennies for the jar, it would take about four years to fill up the jar. How I know is because I knew that there is 365 days in a year so I times it by four.

So to make things easier for me to find out, i have to find out how many coins are there inside the jar. So I start with 1280 and times it by four then divide by three. Which makes 1706.67. I round it up which is makes 1707.

I times the 365 by 5 which makes 1825. So I thought that it was to much. So I was thinking that it would take about 4.7 years to fill the jar. (1560 days is what im thinking)

Please Comment If I did Something Wrong!
Thank You For Reading!


  1. good explanation! it's very detailed and easy to understand

  2. *jaw open*
    very nice work, great colour, superb pictures, amazing detail, why dont you do this more often

    i had NO trouble at all while reading this, a little long though


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