Day 10

• Write the largest six-digit number possible. Read it to the person next to you.
• I'll give a number; you write the next whole number bigger. 17 39 109 999 1 045 10 000
• Write a number between 587 and 600. Read around.
• Write a hard number to read. Read around.
• Doubling: Start with 2. Double it, then double the answer, then double that answer. Keep going until the time is up. (Allow about two minutes.)
• Repeat, starting with 5.
• Repeat, starting with 3.
• Thanks. You may sit down again.

Day 11

• Write the largest seven-digit number possible. Read it to the person next to you.
• I'll give a number; you write the next whole number bigger. 33 59 709 9 999 1 045 100 000
• Write a number between 1 110 and 1 115. Read around.
• Write a hard number to read. Read around.
• Doubling: Start with 3. Double it, then double the answer, then double that answer. Keep going until the time is up. (Allow about two minutes.)
• Repeat, starting with 7.
• Repeat, starting with 9.
• Thanks. You may sit down again.

Day 12

• Write the largest seven-digit number possible. Read it to the person next to you.
• I'll give a number; you write the next whole number bigger. 38 92 799 1 000 9 999 100 000
• Write a number between 1 256 and 1 260. Read around.
• Write a hard number to read. Read around.
• Doubling: Start with 2. Double it, then double the answer, then double that answer. Keep going until the time is up. (Allow about two minutes.)
• Repeat, starting with 11. Repeat, starting with 13.
• Thanks. You may sit down again.