Fill in the blank by rounding off the number to the nearest hundred of $750$.

 

Find the estimated sum of the following numbers by rounding off the numbers to the nearest ten. Find their actual sum as well.

$23+15$

Find the estimated sum of the following numbers by rounding off the numbers to the nearest ten. Find their actual sum as well.

$45+55$

Find the estimated sum of the following numbers by rounding off the numbers to the nearest ten. Find their actual sum as well.

$61+29$

$10+15$ is equal to?

$4$ tens $+ 5$ ones is equal to$?$

$66$ rounded off to the nearest ten is?

Place the digits correctly and add $47+52$.