Question

Complete the following statements with suitable words or figures.

$800+(,,,,,,,+391)=(........+648)+391$

• A. $648$
• B. $800$

Answer 1

Associative property of addition.

Let $a,b,c$are the whole number

Then, $(a+b)+c=a+(b+c)$ is true.

This means the sum does not change even the grouping is changed.