Jharna De Solutions for Chapter: Subtraction, Exercise 11: Mental Maths

There are $42$ students in a class. Today $13$ students are absent. How many students are present in the class?

Decide whether to add or subtract for the following: 

Reena has $32$ crayons. She gets $12$ more crayons. How many crayons does she have now$?$

$54-4=$_____

$67-30=$_____

Subtract the following.

$86-36=$

What is left when $7$ tens is taken away from $89$? (Write the answer in numeral form.)

What should be added to $8$ tens to make $100$?

What do we get when we take away $9$ tens from $98$?