$a

+

$b

=

$result

8

+

4

=

12

8

+

4

=

12

8

+

4

=

12

8

+

4

=

12

8

+

4

=

12

8

+

4

=

12

8

+

4

=

12

8

+

4

=

12

8

+

4

=

12

8

+

4

=

12

8

+

4

=

12