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1. How many squares would be used to make figure 11?. 2A. How many white squares are needed to make Figure 4?. 2B. How many white squares are needed to make Figure 9?. 2C. How many white squares are needed to make Figure 70?. 3A. Draw a 6-dot triangle.
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3B. Explain what 4 could represent in the expression 6 + 5 + 4 dots.
3D. Write a formula that counts the number of dots on an n-dot triangle.
4. Determine the number of toothpicks in Step 15 without drawing the picture.