Day 13

• Go to the board.
• Write the largest four-digit number possible. Read it to the person next to you.
• I'll give a number; you write the next whole number bigger. 56 99 709 9 999
  200 000 1 000 000
• Write a number between 12 600 and 12 700. Read around.
• Write a hard number to read. Read around.
• Doubling: Start with 10. Double it, then double the answer, then double that answer. Keep going until the time is up. (Allow about two minutes.)
• Repeat, starting with 100.
• Repeat, starting with 9.
• I will give you a number. Cut it in half, then cut the answer in half and keep on going until you come to a number that you can't cut in half evenly. Start with 1 000.
• Repeat, starting with 1 200.
• Repeat, starting with 800.
• Thanks. You may sit down again.

Day 14

• Go to the board.
• Write the largest three-digit number possible. Read it to the person next to you.
• I'll give a number; you write the next whole number bigger. 909 6 425 9 999 7 777 99 000
• Write a number between 11 700 and 11 800. Read around.
• Write a hard number to read. Read around.
• Doubling: Start with 200. Double it, then double the answer, then double that answer. Keep going until the time is up. (Allow about two minutes.)
• Repeat, starting with 50.
• Repeat, starting with 30.
• Thanks. You may sit down again.