Question

Arrange the following numbers in suitable groups and then add: $1135,599$ and $865$.

Answer 1

Step $1:$ Firstly see, whose numbers have unit place digit makes sum$10$.

In this case $5+5=10$

So we add, $1135+865=2000$

Step $2:$ $(1135+865)+599$

$$\begin{gathered} =2000+599 \\ =2599 \end{gathered}$$

Hence, the answer is$2599$.