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+(in-package senzill.math)
+
+(defmacro % (number divisor)
+  "Different name for the mod function"
+  `(mod ,number ,divisor))
+
+(defmacro op= (operation value &rest others)
+  "Executes operation on all values and stores result in first argument"
+  `(setf ,value (apply ,operation ,value ',others)))
+
+(defmacro += (value &rest numbers)
+  "Sums all numbers and stores result in name (first argument)"
+  `(op= '+ ,value ,@numbers))
+
+(defmacro ++_ (value)
+  "Adds increments value by one"
+  `(+= ,value 1))
+
+(defmacro -= (value &rest numbers)
+  "Adds all numbers and stores result in name (first argument)"
+  `(op= '- ,value ,@numbers))
+
+(defmacro -- (value)
+  "Decrements value by one"
+  `(-= ,value 1))
+
+(defmacro /= (value &rest numbers)
+  "Divides all numbers and stores result in name (first argument)"
+  `(op= '/ ,value ,@numbers))
+
+(defmacro *= (value &rest numbers)
+  "Multiplies all numbers and stores result in name (first argument)"
+  `(op= '* ,value ,@numbers))