Math Investigations

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Chapter 19

Part 1: Home and School Investigation

Send the Letter to Family (PDF file) home with each child. Once all the children have brought in pictures of the silverware they used for a meal, have them share their drawings with one another. Then sort the drawings by the number of people at each meal. Once you have sorted the drawings, look at each group and help the children notice that every picture with two people eating dinner has the same number of pieces of silverware, every picture with three people eating dinner has the same number of pieces of silverware, etc.

Part 2: Be an Investigator

A good time to do this investigation is after Lesson 3 on multiplying with 10.

Materials

Introducing the Investigation

Put the children in groups. Make some groups of two children, some groups of three children, and some groups of four children. Tell the children that they are going to show with multiplication the total number of eyes, ears, and fingers they have in their group.

Demonstrate this by having three children come to the front of the class. Ask the children how they could use multiplication to show the total number of hands in the group. Since there are three children and each child has two hands, the total number of hands is: 3 x 2 = 6. Write the number sentence on the board for the children. Tell them that they will do the same kind of recording on the worksheet as you did on the board.

Doing the Investigation

When children are finished have the groups of two children share what they found, followed by the groups of three children. Finally, have the groups of four children share what they found. Help the children notice that all the groups with the same number of children in the group got the same results (unless there was a mistake).

Extending the Investigation

Have the children write multiplication sentences to show other things about their group: for example, number of shoes, number of toes, etc.


Houghton Mifflin Math Grade 2