Use a fourth card to make a four-digit number. Name the number and build it.

If you don’t have enough blocks, describe what you would need to build the number.

Your teacher will give you 1 more digit card. Use the last card from your teacher to make a five-digit number. Make the card the first digit. Name the number and build it.

If you don’t have enough blocks, describe what blocks you would need to build the number.

Use the grids to represent each of the following numbers. Then describe or draw a sketch of your representation.

1. 800

2. 1,000

3. 1,500

4. 2,000

How many 10-by-10 grids would you need to represent each of the following numbers? Explain or draw a sketch to show your reasoning.

1. 3,000

2. 6,400

3. 9,000

4. 9,900