Use mental math to solve:

$\left(8\times 9\right)-\left(8\times 8\right)$

Use mental math to solve:

$24÷12\times 9$

Use mental math to solve:

$\left(200+400\right)\times 2$

Use mental math to solve:

$18÷2\times 2$

Use mental math to solve:

$4\times \left(3\times 5\right)$

Use mental math to solve:

$12+6-2$

Use mental math to solve:

$\left(50+100\right)\times 2-100$

Solve the following expression:

$48÷12÷2$

Solve the following expression:

$8\times \left(10-4\right)$