十

1. Origins, structure, and basic meaning

• Structure: 十, read じゅう, means ten, the number after nine.
• Basic usage: Use it to name the number itself or to express a quantity.

2. Common pitfalls and similar expressions

• The number and a quantity
  • The second example names the number as 十.
  • In the first, 十個 adds a counter to express the number of balls.
• Role of the counter
  • 個 is used to count objects.