For the early stages of learning math, this is pretty interesting.
The sum of any number multiplied by 9 will equal 9.
and so on, and so on.
This doesn't really help with multiplication tables, but it's very cool.
By Sharon from Silver Spring MD
It can be a great way to remember the 9 x table because if you notice that the answer starts with one number lower than what is being multiplied by nine ..... and then both numbers add up to nine.
9 x 7 = (one less than 7 is 6) and then adds up to nine. (6 + 3 = 9) answer is 63.
9 x 4 = (one less than 4 is 3) (3+6=9) answer is 36.
9x6 = (one less than 6 is 5) (5+4=9) answer is 54
I hope I have explained that ok :-)
Also if you work with numbers a lot and have tried to figure out if a difference is due to a transposition of numbers or something else, divide by 3. If the difference is evenly divided by 3 then it is probably transposition.
For the younger children, I make up a large poster board with the following:
9 x 1 = 9
9 x 2 - 18
9 x 3 = 27
9 x 4 = 36
Keep going and notice that while the first number in the answer gets larger, the second number gets smaller. I put the board up on the wall by the kitchen table and we read them off while eating breakfast. This worked for my children.
As they got older, I told them to memorize at least one equation in the middle and that would help bring back the rest in a test situation.
The memory board works for all the times tables. Helps to remember them when they are larger than life in front of you for a week at a time.
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