Apparently, nines are the hardest to grasp for primary school children. If only they’d learned how to cheat like me, says Adrian Chiles
Apparently, nines are the hardest to grasp for primary school children. If only they’d learned how to cheat like me, says Adrian Chiles
9s have always been easy for me. Subtract 1 from the other number to get the first digit of the answer, the second digit is whatever digit you would add to the first to make 9.
For 9x6
6-1=5
5+4=9
So the answer is 54.
It happens so fast in my head that I barely even have to think about it.
I just did X*10-X
6x9 = 60, 60-6= 54.