by Dan Meyer

• 1. If you wanted to topple over a domino the size of a skyscraper, how many dominoes would you need?
• 2. Guess as close as you can. Write your guess down.
• 3. Give an answer you think is too high.
• 4. Give an answer you think is too low.

• video — the domino chain reaction

• 5. What information would help solve this problem?

• video — the number of dominos
• link — the dimensions of different skyscrapers

• video — one possible answer

• 6. The distance between each domino also grows by a factor of 1.5. How much space would you need in order to knock down the skyscraper domino? A city block? An airport runway? The entire United States?
• 7. How heavy is the smallest domino?