There was a sub in the eighth grade
math class yesterday. The instructor had
left the instructions for the students to write out their 9 times tables from 1
– 25. They were required to do in their
heads and not use a calculator. It’s not
so bad doing in order. 1X9 of course is
9. Just add 9 to it for your next answer
18 + 9 for your next answer: 27 and down the line. Or you could use my lazy method which I have
been doing since third or 4th grade (whenever it was that we were
taught)
I never did memorize my 9 times
tables, but tens were easy. All you had
to do was tack a zero to the end of the number being multiplied and then take
that number away. Thus 70 -7 is the same
as 9X7. I find subtracting a number is easier than trying to multiply:
When I was taking courses on line, we
required to look up references to back up our theories or understanding or
whatever you want to call it. I am sure
that there are several others that may have come up with this same type of math
solution for multiplying 9. But we didn’t
have the technology then when I figured out subtracting rather than memorizes
the nines table. Thus I am not going to
provide any references other than the pictures I scanned of problems printed by
my hand. I’ve been doing it that way for
decades. It is what works for me. There’s your reference.
