the four arithmetical operations (addition, subtraction, multiplication, division)
小学校で加減乗除の基礎を学んだ。
I learned the basics of the four arithmetic operations in elementary school.
加減乗除を使いこなすのが算数の第一歩だ。
Mastering the four operations is the first step in arithmetic.
加減乗除だけでも多くの問題が解ける。
Many problems can be solved with just the four basic operations.