Math Investigations

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Chapter 10

Part 1: Home and School Investigation

Send the Letter to Family (PDF file) home with each child. Once all of the children have brought in the piece of paper with the value of the coins written on it, put the children in groups of two. Have each pair share with each other the amount of money they got and how they got it. A good time to do this activity is after Lesson 3 on the nickel.

Part 2: Be an Investigator

A good time to do this investigation is after Lesson 4 on dime.


  • Investigator Worksheet (PDF file) for each student
  • crayons
  • 100 pennies
  • 10 dimes
  • number cube with numbers from 1 to 6 on it
  • clear jar

Introducing the Investigation

Say to the children, We are going to roll a number cube every day. The number we roll on the number cube will tell us what number of pennies to get for the day. We will put the pennies in a jar. As we get 10 pennies, we will exchange the ten pennies for a dime. Each of you will keep track of this activity on a worksheet. We will keep doing the activity until we get 10 dimes.

Doing the Investigation

On the first day of the activity give an Investigator Worksheet to each child. Roll a number cube and have the children tell you how many pennies to put in the jar. Have them color in that number of pennies in the first row of their worksheet.

Repeat this each day. After putting the pennies in the jar ask Do you think we have ten pennies in the jar yet? Count the pennies. If there are 10 or more pennies, exchange a group of pennies for one dime. Have the children continue to color in the pennies on their worksheet to show how many pennies went into the jar. Since there are 10 pennies in each row on the worksheet, each row of pennies represents one dime.

As you get further into the investigation, ask the children if they think there are 10 dimes in the jar yet. Count the dimes to find out how many there are?

After you have done this activity for a few days, ask the children every once in a while how many more days they think it will take to get 10 dimes. This will give the children valuable experience with estimation.

Houghton Mifflin Math Grade K