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Monday, December 12, 2011

Place values 确定数位。

1. What number is shown? 以下积木显示什么数目?
one blockone blockone blockone blockone blockone blockone block

2. What number is shown? 以下积木显示什么数目?
stack of ten blocksstack of ten blocksstack of ten blocksstack of ten blocksstack of ten blocksstack of ten blocksstack of ten blocksone blockone blockone block

3. What number is shown? 以下积木显示什么数目?
stack of ten blocksstack of ten blocksstack of ten blocksstack of ten blocksstack of ten blocksstack of ten blocksstack of ten blocksstack of ten blocksstack of ten blocksone block

4. Which place-value model shows 32? 以下积木哪个是32?
stack of ten blocksstack of ten blocksone blockone blockone block
stack of ten blocksstack of ten blocksstack of ten blocksone blockone block

5. Which place-value model shows 20? 以下积木哪个是20?
one blockone block
stack of ten blocksstack of ten blocks





ANSWERS答案:
1. 7     2. 73     3. 91
4.                
stack of ten blocksstack of ten blocksstack of ten blocksone blockone block


stack of ten blocksstack of ten blocks5.

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