Number of degrees in three and one half right angles is;

Look at the following pattern

$\left(9-1\right)÷8=1$

$\left(98-2\right)÷8=12$

$\left(987-3\right)÷8=123$

$\left(9876-4\right)÷8=1234$

According to this pattern, $\left(987654-6\right)÷8$ is;

Find the number of triangles in the given figure.

Study the following pattern $9 \times 9 = 81, 99 \times 99 = 9801, 999 \times 999 = 998001$............. What is $99999 \times 99999?$

In the figure, $\angle$$ABD$ and $\angle$$CBD$ are mutually: 

For which Value of $x$, the $AOB$ will be a straight line: 

Study the following pattern:
$9 \times 9 + 7 = 88$
$98 \times 9 + 6 = 888$

$987\times 9+ 5=8888$

What is $987654\times 9 +2$?