Fast Mental Maths tricks

Everything from basic math up through high school!

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koconnor
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Fast Mental Maths tricks

Postby koconnor » Sat Feb 09, 2008 2:55 pm

Fall in love with maths again!

http://www.vedic-maths-ebook.com

Mathmom
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Postby Mathmom » Mon Feb 11, 2008 3:18 pm

Hi,
Thanks for sharing.
I'm glad to see the 11's trick, again. It's the one I have trouble doing in my head. Do you actually do it in your head? Or do you put it down on paper until you get better at it? What about with the other ones you have in the pdf?
My 9 yr old son loves doing math in his head. Sometimes he uses tricks he learned. He uses whatever one is easiest, like you say to do.
It doesn't look like we've learned all of these on your pdf.
Thank you for sharing.
I recommmend parents to learn these tricks along with their children. They are very useful.
I didn't see the trick for multiplying by 5's. Do you know that one?
Just wondering. :o

Mathmom
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Postby Mathmom » Wed Feb 13, 2008 3:54 pm


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seekingmyLord
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Postby seekingmyLord » Thu Feb 14, 2008 8:35 am

We have not yet started multiplication, but we begin simple multiplication next month if all goes well with my lesson plans. :shock:--Amazing how they just keep on learning! It was just last spring that she really struggled with the concept of subtraction!

Right now my daughter really into adding and subtracting 9's, as in 4+9=13 because 3 is on less than 4 and then we simply add 10 and 17-9=8 because 8 is one more than 7 and the 10 is gone.

She also is into using doubles, as in 7+7=14 so 7+8=15.

It is just so cool to watch her thinking it out!

Mathmom
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Postby Mathmom » Thu Feb 14, 2008 8:47 am

Hi Seeking,
Are you doing this adding/subtracting on paper? With pictures? Manipulatives, or are you doing mental math?
Just wondering because we do almost all verbal math problems that we make up. We do have a lot of books about math topics, though.
I like seeing how much fun they have playing around with numbers. It's sad to hear so many others(not you) saying they and their kids don't like math.
Let's keep making it fun. :lol:

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seekingmyLord
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Postby seekingmyLord » Thu Feb 14, 2008 9:58 am


scatteredpearl
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Multiplying by 9's

Postby scatteredpearl » Sun Feb 17, 2008 12:46 pm

Does everyone know the 9's trick?

4x9=

Hold up you ten fingers, and put down the corresponding finger.

l l l l l l l l l l

In this case 4.

4
l l l i l l l l l l

You made two different numbers.

4
l l l i l l l l l l
123 1 123456
3 6
36

4x9=36

Works with all single digits but can be used for larger multuplying, just remember to carry.

kolds
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This isn't as much a trick as much as just fun

Postby kolds » Thu Mar 20, 2008 11:45 am



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