Yes, multiplication table is one of the easiest next to tables of 0, 1 and 2.
Most of us fear this number, 9, because it is such a horror to multiply that big number to other numbers. But fear not cause I will show you how this multiplication table is going to be so easy for you.
First take a look t it:
| 9 x 1 = 9 | 9 x 6 = 54 |
| 9 x 2 = 18 | 9 x 7 = 63 |
| 9 x 3 = 27 | 9 x 8 = 72 |
| 9 x 4 = 36 | 9 x 9 = 81 |
| 9 x 5 = 45 | 9 x 10 = 90 |
looking at it now, do you notice anything?
Okay, let me rewrite it, here goes:
| 9 x 1 = 9 | 9 x 10 = 90 |
| 9 x 2 = 18 | 9 x 9 = 81 |
| 9 x 3 = 27 | 9 x 8 = 72 |
| 9 x 4 = 36 | 9 x 7 = 63 |
| 9 x 5 = 45 | 9 x 6 = 54 |
now, look at the color coded number.
Notice that the product of 9 x 2 being 18 is the reverse of 9 x 9 being 81. The same goes for 9 x 3 = 27 and 9 x 8 = 72, and so on and so forth.
Another, tip is this. Let's take 9 x 3 = 27. Notice that the product 27 if written 2 + 7 = 9. And 2 is one less than 3. So, to simplify it the product of any numbers from 1 to 10 multiplied by 9 when added together is always equivalent to 9. Another thing is subtract 1 from the number to be multiplied by 9 then think of a number to add to it that will give the sum of 9.
To illustrate it let's take :
9 x 8 = 72, 7 is 1 less 8, add 2 to it and you get 9.
9 x 8 = 72 (7 + 2 = 9).
I hope this material helps everyone who reads this.