Jun 3, 2018
Adhd can be useful sometimes
Here's a trick to times numbers by 9 that works up to 9x9 (if you find a pattern for 9x10 please tell me because I can't find it) that I worked out in 2nd grade because I struggle to multiply numbers higher than 6 in my mind and common core hated me for it.
9x5=?
Minus 1 from whatever "non 9" number you have
5-1=4 (this is your tens place)
Then count back up to 9 from that tens place number
4+[5]=9 (5 is your ones place)
So there you go. 9x5= 45
9x8=?
>8-1=7
>7+[2]=9
9x8=72
9x6=?
>6-1=5
>5+[4]=9
9x6=54
Etc