Subtraction — the basic mathematical operation of taking one number away from another.
この問題は引き算で解けるよ。
You can solve this problem by subtraction.
先生は子どもたちに引き算のやり方を丁寧に教えた。
The teacher carefully taught the children how to do subtraction.
引き算と足し算を交互に練習すると計算が速くなる。
Practicing subtraction and addition alternately makes calculation faster.