Addition

Addition is the mathematical way of putting things together. (វិធីបូក ជាការបន្ថែម វត្ថុ ចូលគ្នា)

a + b is called addition

$$+$$ is called addition sign

Formula
a + b = b + a a + (-b) = a - b a + 0 = a a + b + c = (a + b) + c = a + (b + c) (-a) + b = b - a (-a) + (-b) = - (a + b)