index.md

---

title: Subtraction
slug: WebAssembly/Reference/Numeric/Subtraction

---

{{WebAssemblySidebar}}

The sub instructions, short for subtraction, are used for subtracting one number from another number, similar to the - operator in other languages.

{{EmbedInteractiveExample("pages/wat/sub.html", "tabbed-taller")}}

Syntax

;; load two numbers onto the stack
i32.const 10
i32.const 3

;; subtract one number from the other
i32.sub

;; the top item on the stack will now be 7 (10 - 3 = 7)

Instruction	Binary opcode
i32.sub	0x6b
i64.sub	0x7d
f32.sub	0x93
f64.sub	0xa1