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GMAT Multiplication Tables

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Joined: 19 Apr 2011
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Re: GMAT Multiplication Tables  [#permalink]

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New post 01 Jun 2011, 06:11
but we need memorize this right. There is no shortcut
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Re: GMAT Multiplication Tables  [#permalink]

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New post 01 Jun 2011, 07:18
1
I'm not sure you need to memorize all those numbers except squares. It's better to have shortcuts for multiplication. For example, It's not easy to calculate 18*12 mentally but 18*10 + 18*2 = 180 + 36 = 216 is pretty manageable. Or let's say 15*14? 15*14=30*7=210. Or 19*13? 20*13-13 = 260-13 = 247
As you see a couple of little tricks can help.

By the way, something very interesting is now under development in GMAT ToolKit that's going to address the problem.
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Re: GMAT Multiplication Tables  [#permalink]

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New post 01 Jun 2011, 09:33
The GMAT is not going to ask you to multiply 23 by 29, so you don't need to learn the table above; that would just be a waste of time. You should know your times table from grade school (up to 12x12), and maybe up to 13*13 since the number 13 shows up for a few reasons, and you may want to know some larger perfect squares. You don't need to know what 19 times 26 is off the top of your head; that just won't ever show up on your test (or if it did, you could use estimation or units digits to bypass the calculation completely).
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Re: GMAT Multiplication Tables  [#permalink]

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New post 01 Jun 2011, 20:57
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toughmat wrote:
but we need memorize this right. There is no shortcut


If I may add to others view.

regarding memorizing the tables, it does save time if you memorize. I know it doesnt happen overnight, but there is a way. For instance, I took all the numbers and started singing a song (From a bollywood movie - will upload the movie one day :) ) . That does work. My mum used to teach me multiplication tables that way.

If memorizing isnt your cup of tea, the second best way to sort this out is to used vedic maths 2 number multiplication

23
* 45 (put it one below another)
-------------------
multiply left most | multiply diagonal | multiply right most
2*4 | 2*5 + 3 * 4 | 3 * 5

8 | 22 | 15

carry over digits from right to left

8 | 22 +1 |5 => 8 | 23 | 5
8 + 2 | 3 | 5
10 | 3 | 5

Answer is 1035

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Arvind
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New post 14 Aug 2017, 23:36
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Re: GMAT Multiplication Tables   [#permalink] 14 Aug 2017, 23:36
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