Addition and Subtraction

Count and write the number of two-digit numbers we have.

Subtract the numbers:

$68-6$

Add the numbers:

$45+5$

Use mental strategies to check the answer. For any incorrect answer, give the correct answer and explain what you think went wrong when the second number was added on the calculator.

$125+36=161$

Use mental strategies to check the answer. For any incorrect answer, give the correct answer and explain what you think went wrong when the second number was added on the calculator.

$49+48=98$

What is the difference between $9$ and $34$.

What is the difference between $13$ and $18$.

Choose the best estimate.

$121-49$ is:

$18-6=$_____

$14-6=$_____

$10-6=$_____

$9-4=$

Children of Chamacham Toli counted the number of trees in the park.

 trees were more than  trees. How many more?

(If the answer is K trees, then write the value of K in the answer box)

Amal's class got $30$ stamps on Children's Day. On Monday $18$ Children bought stamps and on Tuesday $12$ children bought stamps.

How many stamps were left after Monday$?$ _____. After Tuesday $?$ _____

Let's look at it this way.

How many stamps were bought in all $?$ _____. How many are left $?$ _____

Which method is easier ?

Find the missing numbers:

Subtract the numbers.

$25-$_____$=25$

Subtract the numbers.

$95-$_____$=80$

Subtract the numbers.

$75-75=$_____

Subtract the numbers in the first column of the following grid. Then identify where your answer lies. Observe the example.

Subtract the numbers in the first column of the following grid. Then identify where your answer lies. Observe the example.