下表列出了所有的Lua語言支持的算術運算符。假設變量A持有10和變量B持有20，則：

運算符	描述	示例
+	兩個操作數相加	A + B = 30
-	從所述的第一個減去第二操作數	A - B = -10
*	兩個操作數相乘	A * B = 200
/	通過分子除以反分子	B / A = 2
%	模運算和整數除法後的餘數	B % A = 0
^	指數運算符需要的指數	A^2 = 100
-	一元運算 - 運算符相當於取反	-A = -10

例子

試試下麵的例子就明白了所有的Lua編程語言提供了算術運算符：

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 )

當執行上麵的程序，它會產生以下結果：

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