割り算

1. Origins, structure, and basic meaning

• Structure: 割り算 (わりざん) is a compound noun for division, the arithmetic operation finding a quotient and remainder.
• Basic usage: 割り算を習った makes the operation learned after multiplication tables the object, while この割り算は余りが二 predicates the remainder of a particular problem.

2. Common pitfalls and similar expressions

• Operation type and computed remainder
  • 割り算を習う concerns learning the method, whereas 割り算は余りが二 is the result of one problem. The remainder itself is not the whole division operation.