Q

# To find sum of three numbers 14, 27 and 13 we can have two ways : (a) We may first add 14 and 27 to get 41 and then add 13 to it to get the total sum 54

Q. 5.     To find sum of three numbers $\inline 14,$  $\inline 27$  and  $\inline 13,$ we can have two ways:

(a) We may first add $\inline 14$ and $\inline 27$ to get $\inline 41$ and then add $\inline 13$ to it to get the total  sum $\inline 54$ or

(b) We may add $\inline 27$ and $\inline 13$ to get $\inline 40$ and then add $\inline 14$ to get the sum  $\inline 54.$ Thus,$\inline (14+27)+13=14+(27+13)$

This can be done for any three numbers. This property is known as the associativity of addition of numbers. Express this property which we have already studied in the chapter on Whole Numbers, in a general way, by using variables a, b and c.

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