Nine

How to type it

Right ring finger. Introduced in Lesson 21: Numbers: 6 to 0.

Common uses

• A regulation baseball game has nine innings.
• In the United States, 911 is the emergency number.
• Prices often end in 9, as in 9.99.

Less common uses

• Nine is the largest single digit in base ten.
• Casting out nines, an old arithmetic check, works because a number and its digit sum leave the same remainder when divided by 9.