It's actually quite easy.

Let me show you.

I'm assuming you know your timestables.

You probably do know them. Perhaps 6 x 7, 6 x 6, 7 x 7, 7 x 8 and 8 x 8 are a little tricky. For those, use building blocks

e.g 6 x 7

5 x 7 = 35

Add on a 7 and you get 42.

Once you've nailed the timestables we can then move on to harder multiplications.

To multiply a 2 digit by a 1 digit, you could use short multiplication but why not do it in your head with some jottings.

e.g 17 x 8

You want to do the tens first and then the units.

To do this, do 10 x 8.

That's 80

Then do 7 x 8

That's 56

And add them together.

80 + 56

Add the 10's first.

80 + 50 = 130

Then the units.

0 + 6 = 6

The answer is 136