GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 23 May 2019, 00:12

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# GMAT Multiplication Tables

Author Message
TAGS:

### Hide Tags

Manager
Joined: 19 Apr 2011
Posts: 84

### Show Tags

01 Jun 2011, 06:11
but we need memorize this right. There is no shortcut
CEO
Joined: 17 Nov 2007
Posts: 3408
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

### Show Tags

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.
_________________
HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | Limited GMAT/GRE Math tutoring in Chicago
GMAT Tutor
Joined: 24 Jun 2008
Posts: 1524

### Show Tags

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).
_________________
GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com
Intern
Joined: 11 Aug 2007
Posts: 2

### Show Tags

01 Jun 2011, 20:57
2
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

Regards
Arvind
Non-Human User
Joined: 09 Sep 2013
Posts: 10995

### Show Tags

14 Aug 2017, 23:36
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: GMAT Multiplication Tables   [#permalink] 14 Aug 2017, 23:36
Display posts from previous: Sort by