Trick # 1
Whenever you multiply a number by another number that ends with a 0, it is just like taking away the 0, multiplying the remaining numbers, and then adding back the zero.
8 x 20 is like 8 x 2 which is 16. Add the zero back. 160.
Trick # 2
Breaking down a number to its EXPANDED FORM helps you multiply faster than your teacher.
The "Expanded form" of 256 is (200 + 50 + 6). 200 + 50 + 6 is the same as 256.
Here are some examples of TRICK # 1
Here are some examples of TRICK # 2
So, what is 12 x 46?
12 is like (10+2) and 46 is like (40+6). So 12 x 46 is like (10+2) x (40+6). Now all you have to do is multiply every term in the 1st group by every term in the 2nd group and ADD them together.
You can see in the last example that I turned the 12 into (10 + 2) because makes it easier to add visually and mentally. 140 can become (100 + 40) also.
133 x 20? Well, first I drop off that zero (I will add it back later). Then I multiply. I get 200 + 60 + 6. That sounds like expanded form! 266. NOW ADD THE ZERO BACK. 2660 is the answer.
It's the same no matter how large the numbers get. It is best to add similar numbers together first. I add the 7 digit numbers together first and then I added the 5 digit numbers together and so on.
As a tip, do each column of three at a time.
And if you saw my guide on "How to add faster than your Teacher " before this one, adding the numbers on the right will be no sweat.
The creator of this guide has not included tools