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## Chapter 11

### 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 their pictures, put the children in groups of four. Have each group order the numbers pictured from least to greatest. A good time to do this activity is after Lesson 1 on ordering numbers.

### Part 2: Be an Investigator

A good time to do this investigation is after Lesson 5 on using symbols to compare numbers.

#### Introducing the Investigation

Ask the children how many times they think they can jump in 30 seconds or half a minute. Listen to their guesses and then tell them that they are going to find out. Tell them they will also compare the number of jumps they made with others in the class.

#### Doing the Investigation

Tell the children that you are going to time them for 30 seconds. When you say, Start they should start jumping and when you say, Stop they should stop jumping. Tell them to count the number of jumps they make. When they are finished ask them to write the number of jumps they made on the space provided on the Investigator Worksheet.

Then have each child find a partner. They should write their names on each other's worksheets and write the number of jumps they made. Children then write ‹, =, or › in the circle to complete the expression. Give children time to do this, and then say Switch to a new partner. Have the children switch to new partners until their worksheet is complete.