倍

1. Origins, structure, and basic meaning

• Structure: 倍, read ばい, denotes a multiplier expressing how many times one quantity is relative to a baseline.
• Basic usage: It expresses a multiple relative to a baseline, such as twice a box’s weight or double last year’s attendance.

2. Common pitfalls and similar expressions

• A multiple needs a baseline
  • In an expression such as 二倍, distinguish the baseline quantity from the resulting multiple.