Question

Arrange the following numbers in suitable groups and then add : $133,698$ and $867$.

Answer 1

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

In this case $7+3=10$

So we add, $133+867=1000$

Step $2:$ $(133+867)+698$

$$\begin{gathered} =1000+698 \\ =1698 \end{gathered}$$

Hence, the answer is $1698$.