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)
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14365x9=129285 (143650-14365=129285)
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Who know this way, comment.