Add and match:

$13+8$	$18$	$15+5$
$19+9$	$19$	$6+10$
$10+9$	$20$	$16+2$
$5+15$	$28$	$7+12$
$12+4$	$21$	$11+17$
$2+16$	$16$	$18+3$

Add the following.

$\underline{\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 3& 2\\ +& 4& 1\\ & & \end{array}}$

Perform addition and find the sum.

$\underline{\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 2& 2\\ +& 3& 4\\ & & \end{array}}$

Perform addition and find the sum.

$\underline{\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 3& 7\\ +& 4& 1\\ & & \end{array}}$

Perform addition and find the sum.

$\underline{\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 3& 6\\ +& 1& 1\\ & & \end{array}}$

Perform addition and find the sum.

$\underline{\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 4& 5\\ +& 1& 2\\ & & \end{array}}$

Perform addition and find the sum.

$\underline{\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 6& 3\\ +& 1& 3\\ & & \end{array}}$

Perform addition and find the sum.

$\underline{\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 4& 6\\ +& 1& 0\\ & & \end{array}}$

Perform addition and find the sum.

$\underline{\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 7& 5\\ +& 1& 3\\ & & \end{array}}$