Help with Opening PDF Files

## Chapter 13

### Part 1: Home and School Investigation

Send the Letter to Family (PDF file) home with each child. Once all the children have brought in their pictures showing the adults and children in their families, group the children in pairs. Have the paired children compare their two families and talk about how the numbers are alike and different. A good time to do this activity is after Lesson 6 on practicing addition.

### Part 2: Be an Investigator

A good time to do this investigation is after Lesson 6 on practicing addition.

#### Introducing the Investigation

Tell children they are going to play a game in pairs. Show them the cards you have made from the Investigator Worksheet. Have each child draw two cards from the deck. Each child will make a prediction of who will get the greatest number when the two cards are added. Once they make their predictions, the children do the addition, check each others addition, and see who got the greatest number. They can use counters to help them do this. Whoever predicted correctly scores a point. Have each child keep track of his or her score on a separate piece of paper by making a tally mark for each correct prediction.

#### Doing the Investigation

Watch children as they play the game. Make sure they understand how to play and are keeping track of the score.

Help children use the counters to find the sum by putting counters down to represent each number. Once both children in a pair have found their sum with the counters, they can use one-to-one correspondence with the counters to find who got the greatest sum.

After the children have played the game, ask them to talk about how they made their predictions.