Changing

Materials
- Supply box
- A mat


Presentation

1. Invite the child to come and work with you.
2. Have him unroll a mat and have him bring the supply box over to it.
3. Have the child set out the material on the mat as in the Supply Mat.
4. Have the child count out the units and place then in a vertical line.
5. When he gets to ten units, show him how it looks just like the ten-bar.
6. Have the child continue in this manner, each time noticing the look alike to the ten-bar.
7. Continue until there are no more units. Look at the remaining units that cannot be formed into a ten-bar and ask the child if there are enough units to create a ten-bar. Ask the child why this is so.
8. Have him count how many ten-bars he had made by using the units.
9. Have him then count the ten-bars and place them side by side.
10. When he has counted ten ten-bars, notice how it looks just like the hundred square.
11. Repeat until all of the ten-bars have been used. If there are some ten-bars left over, ask the child if there are enough to make a hundred square. Discuss why with the child.
12. Have the child count how many hundred squares he made by using the ten-bars.
13. Then have the child count the hundred squares by stacking them on top of each other.
14. When the child reaches 10 hundreds, discuss how this looks like the thousand cube.
15. Repeat until there are no more hundred squares. If there are any left over that cannot be made into a thousand cube discuss why with the child.
16. Have the child count how many thousand cubes he made using the hundred squares.
17. Go back and count how many units, tens, and hundreds were left over.
18. Then put the material away.

Purpose

Direct
To make the child aware that 10 units can be changed into a ten-bar, ten ten-bars can be changed into a hundred square, and ten hundred squares can be changed into a thousand cube. 

Control of Error
The material and the directress.

Age
4 1/2 years

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