If we add any 2 groups of numbers first, and then add third

We get the same answer

This is called Associativity of Addition

(a + b) + c = a + (b + c)

**
Example
**

For 2, 3 & 4

Hence

(2 + 3) + 4 = 2 + (3 + 4)

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class