I gave ds a trick for 6's, maybe it's mentioned already in the thread; 6x7 is the same as 5x7 + 7, fives are so easy and then the adding is no biggy. (6 * x = 5*x +x )
I was pleased to see he realized on his own he could apply this to the 9's using the 10's: 9x7 is the same as 10*7 -7...
He definitely enjoys learning more of the tricks and patterns - rote memorization is like complete torture for the whole family!
(oh, and since christmas is fast approaching... we like to sing '6 times 3, oh 6 times 3, you always equal 18...this is to the tune of O'Christmas Tree.
)
