# 9 Multiplication Table Secret (easy)!!!!!!!

1,364

10

4

## Introduction: 9 Multiplication Table Secret (easy)!!!!!!!

This way i search in google but find only with fingers. Maybe this my discoveries :D

The easiest way to calculate 9x with - :

1x9=9 (10-1=9)

2x9=18 (20-2=18)

3x9=27 (30-3=27)

4x9=36 (40-4=36)

5x9=45 (50-5=45)

6x9=54 (60-6=54)

7x9=63 (70-7=63)

8x9=72 (80-8=72)

9x9=81 (90-9=81)

10x9=90 (100-10=90)

11x9=99 (110-11=99)

12x9=108 (120-12=108)

....................

14365x9=129285 (143650-14365=129285)

....................

Who know this way, comment.

## 4 Discussions

any 2 digits X11 as follow: 54X11 =5(5+4)4 =594. 23X11= 2(2+3)3 = 253. For digits that = more than 10 like 47 or 98 do as follow: 47X11 = 4(4+7)7 = 4(11)7 = (4+1)17 so it would be 517. 98 would be 9(9+8)8 =9(17)8 = (9+1)78 =1078

NOTE: I have used = where I should not have.

If you want to X5 then X10 and then divide by 2. 5 = 10/2. like 480 X 5 = 4800/2 = 2400

the way i learned the 9 times tables is is to take 1 away from the number you multiply times nine for the tens position then nine minus the tens position for the ones position

for example ... 9 x 2 = 2-1 is 1(the one goes in the tens column) 9-1 is 8 (the eight goes in the ones column)

unfortunately that method only work up until 10 .. your system is more flexible