Addition and Subtraction of Three Digit Numbers

Add the following:

$\underline{\begin{array}{ccccc}& \mathrm{Th}& \mathrm{H}& \mathrm{T}& \mathrm{U}\\ & & 4& 5& 2\\ & +& 3& 2& 1\end{array}}$

A teacher has identified talented students in drawing and singing as follows.

Find out :

Total number of singers and artists $=$ _____.

$\underline{\begin{array}{cccc}& 6& 0& 0\\ -& 4& 5& 2\\ & & & \end{array}}$

Subtract.

$199-170$

Subtract.

$\underline{\begin{array}{cccc}& \mathrm{H}& \mathrm{T}& \mathrm{O}\\ & 6& 7& 2\\ -& 3& 6& 1\\ & & & \end{array}}$

Subtract.

$\underline{\begin{array}{cccc}& \mathrm{H}& \mathrm{T}& \mathrm{O}\\ & 4& 5& 7\\ -& 2& 3& 4\\ & & & \end{array}}$

The number $100$ less than $999$ is _____.

The number $100$ less than $511$ is _____.

The number $100$ less than $453$ is _____.

The number $100$ less than $206$ is _____.

The number $100$ less than $900$ is _____.

The number $100$ less than $640$ is _____.

The number $100$ more than $890$ is _____.

The number $100$ more than $252$ is _____.

The number $100$ more than $609$ is _____.

The number $100$ more than $812$ is _____.

Balu has done some subtraction problems. Verify and correct the mistakes.

$\begin{array}{cccc}& \mathrm{H}& \mathrm{T}& \mathrm{O}\\ & 9& 8& 7\\ -& 4& 5& 6\\ & 5& 3& 1\end{array}$

Look for linking numbers to save time in written addition.

$\begin{array}{cccc}& 5& 9& 3\\ & 2& 1& 8\\ & 8& 9& 8\\ +& 5& 9& 8\\ & & & \end{array}$

Look for linking numbers to save time in written addition.

$\begin{array}{cccc}& 4& 7& 5\\ & 1& 0& 1\\ & 1& 3& 5\\ +& 6& 0& 9\\ & & & \end{array}$

Look for linking numbers to save time in written addition.

$\begin{array}{cccc}& 1& 8& 4\\ & 2& 3& 5\\ & 2& 2& 6\\ +& 1& 7& 0\\ & & & \end{array}$