Unit 8 Contents

Check-In: Questions 14–17

1. 25 2 =
2. 25 0.2 =
3. 25 0.02 =
4. 25 0.002 =
5. 25 0.0002 =

1. How does a decimal point move to show that the product is larger?
2. How does a decimal point move to show that a product is 10 times larger?
3. How does a decimal point move to show that the product is smaller?
4. How does a decimal point move to show that a product is 100 times smaller?
5. How does a decimal point move to show that a product is 1000 times smaller?
1. In which number is the digit 2 larger: 2.50 or 0.25? How much larger?
2. In which number is the digit 5 smaller: 2.50 or 0.25? How much smaller?

Mr. Moreno presented the class with this problem:

I have 3 strips of tape. Each piece is 2.2 meters long.

Nicholas used a rectangle model to multiply. He broke 2.2 into 2.0 + 0.2. He multiplied 3 2 and got 6. He multiplied 3 0.2 and got 0.6. He added 6 + 0.6 for a sum of 6.6.

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