下表列出了所有的Lua语言支持的算术运算符。假设变量A持有10和变量B持有20，则：

运算符	描述	示例
+	两个操作数相加	A + B = 30
-	从所述的第一个减去第二操作数	A - B = -10
*	两个操作数相乘	A * B = 200
/	通过分子除以反分子	B / A = 2
%	模运算和整数除法后的余数	B % A = 0
^	指数运算符需要的指数	A^2 = 100
-	一元运算 - 运算符相当于取反	-A = -10

例子

试试下面的例子就明白了所有的Lua编程语言提供了算术运算符：

a = 21
b = 10
c = a + b
print("Line 1 - Value of c is ", c )
c = a - b
print("Line 2 - Value of c is ", c )
c = a * b
print("Line 3 - Value of c is ", c )
c = a / b
print("Line 4 - Value of c is ", c )
c = a % b
print("Line 5 - Value of c is ", c )
c = a^2
print("Line 6 - Value of c is ", c )
c = -a
print("Line 7 - Value of c is ", c )

当执行上面的程序，它会产生以下结果：

Line 1 - Value of c is 	31
Line 2 - Value of c is 	11
Line 3 - Value of c is 	210
Line 4 - Value of c is 	2.1
Line 5 - Value of c is 	1
Line 6 - Value of c is 	441
Line 7 - Value of c is 	-21