diff --git a/hal/instructions.go b/hal/instructions.go
index 53c6808..b0913aa 100644
--- a/hal/instructions.go
+++ b/hal/instructions.go
@@ -50,6 +50,9 @@ var instructions = []*Instruction{
 	InstructionJump,
 	InstructionAdd,
 	InstructionAddNum,
+	InstructionSubNum,
+	InstructionMulNum,
+	InstructionDivNum,
 }
 
 var InstructionStart = &Instruction{
@@ -171,10 +174,28 @@ var InstructionAdd = &Instruction{
 	},
 }
 
-var InstructionAddNum = &Instruction{
-	Name: "ADDNUM",
-	ExecuteWithOperand: func(module *Module, operand float64) error {
-		module.accumulator = module.accumulator + operand
-		return nil
-	},
+func newMathNumInstruction(name string, operation func(accumulator, value float64) float64) *Instruction {
+	return &Instruction{
+		Name: name,
+		ExecuteWithOperand: func(module *Module, operand float64) error {
+			module.accumulator = operation(module.accumulator, operand)
+			return nil
+		},
+	}
 }
+
+var InstructionAddNum = newMathNumInstruction("ADDNUM", func(accumulator, value float64) float64 {
+	return accumulator + value
+})
+
+var InstructionSubNum = newMathNumInstruction("SUBNUM", func(accumulator, value float64) float64 {
+	return accumulator - value
+})
+
+var InstructionMulNum = newMathNumInstruction("MULNUM", func(accumulator, value float64) float64 {
+	return accumulator * value
+})
+
+var InstructionDivNum = newMathNumInstruction("DIVNUM", func(accumulator, value float64) float64 {
+	return accumulator / value
+})