Comments on: In Which We Take The Wrong Approach

By: Rebecca

Rebecca — Thu, 20 Mar 2008 21:06:05 +0000

First of all, the talks with Drew you mentioned? Hysterical.

Second of all, an easy way to remember the nines table is that up to 5 and then back down to 10, they reverse themselves.

9*1= 09
9*2= 18
9*3= 27
9*4= 36
9*5= 45
Now the answers are inverted…
9*6= 54
9*7= 63
9*8= 72
9*9= 81
9*10= 90

Hopefully that helps. It helped me when I learned them!

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By: PhxButterfly

PhxButterfly — Tue, 18 Mar 2008 18:08:15 +0000

I think I would address the issue as to why Porter’s teacher would tell him 9 X 3 is 28 ??? I’ve heard of new math, but, something is rotten in Denmark, imho!

By: Barbara Ling (aka Owlbert)

Barbara Ling (aka Owlbert) — Mon, 17 Mar 2008 11:57:10 +0000

Just wait until the teacher informs him that 3 divided by 0 is 0. I remember my kids’ 3rd grade teacher telling my child this fantasy of sheer idjutness; when asked, I was told that the concept of ‘undefined’ was too complicated to get into “just then.”

Sigh. Makes me glad such sites like Edhelper.com are available for parents who like their kids staying ahead.

Enjoy,

Barbara

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By: MamaD4

MamaD4 — Mon, 17 Mar 2008 07:42:15 +0000

Anne, you probably know your multiplication through the 11s. Think about it…

There, now don’t you feel even smarter?

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By: Charlie on the PA Turnpike

Charlie on the PA Turnpike — Mon, 17 Mar 2008 03:00:59 +0000

One of the tricks I learned that helped me master 9x was the notion that 9*10=90, 9*9=81, 9*8=72 … noting the ones place progressively increases while the tens decreases.

That all falls over *11 and *12, but that trick worked for me.

Geeze, that was a lot of survey questions!

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By: Jesse

Jesse — Mon, 17 Mar 2008 02:27:45 +0000

Don’t be too quick to dismiss what he says about his teacher, though. My brother had a third grade teacher that SWORE that Washington D.C. was in Washington State, even when my brother got up to show her on the map. It took my mother and father talking to her to help her see her mistake.

Of course, if it IS just him, give him plenty of opportunities to practice it - like any time you buy multiples of something in the grocery store, have him do the multiplying for you, etc.

By: Catherine

Catherine — Sun, 16 Mar 2008 23:03:12 +0000

I didn’t know that 9 multiplied always equaled 9! What I was going to add, although now it seems not as cool, is that if you hold out all ten fingers, fold down the third from the left you are left with 2, bent digit, 7 … 27. So now he has two ways to check his 9 multiples.

I think knowing multiples through the 12s is helpful when determining square inches of something. Which for some reason that I cannot recall, I was doing recently.

By: Waidmann

Waidmann — Sun, 16 Mar 2008 21:05:40 +0000

Anne,

Just tell him that any multiplication fact (is that what they’re calling the math tables these days?) with a “9″ in it must add up to “9″. That always helped me remember “27″, although my bugaboo was always confusing 9X6 and 8X7. 54 and 56 were just too similar, I guess.

Waidmann