Question

Arrange the following numbers in suitable groups and then add: $1962,453,1538$ and $647$.

Answer 1

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

In this case $7+3=10$

Also, $8+2=10$

So we add, $1962+1538=3500$

$453+647=1100$

Step $2:$ $(1962+1538)+(453+647)$

$$\begin{gathered} =3500+1100 \\ =4600 \end{gathered}$$

Hence, the answer is $4600$.