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Simple Arithmetic Question: How do you multiply 16 by 123?

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Simple Arithmetic Question: How do you multiply 16 by 123? [#permalink] New post 03 Mar 2012, 17:57
The method I usually use:

10 x 123 = 1230

6 x 100 = 600
6 x 20 = 120
6 x 3 = 18

1230+600+120+18=1968
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Re: Simple Arithmetic Question: How do you multiply 16 by 123? [#permalink] New post 11 Mar 2012, 20:14
You can add half to first calculation then add 123.. I usually use your method though.

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Re: Simple Arithmetic Question: How do you multiply 16 by 123? [#permalink] New post 12 Mar 2012, 00:00
Expert's post
ForSQ wrote:
The method I usually use:

10 x 123 = 1230

6 x 100 = 600
6 x 20 = 120
6 x 3 = 18

1230+600+120+18=1968


You will not need to do such a calculation on actual GMAT very often. But when you do, for the sake of speed, it is a very good idea to know the multiplication tables (upto 20)

16 * 123
Then you multiply as if 16 is just any other single digit number with which you are multiplying. This is what you do then: 16 times 3 gives 48 so write 8 and carry 4.
16 times 2 is 32, add 4 so 36. Write 6 and carry 3
16 times 1 is 16, add 3 to get 19. Write 19
You get 1968

I know learning tables is a pain but I distinctly remember thanking my dad during my GMAT since he used to insist that I should know my tables out cold.
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Re: Simple Arithmetic Question: How do you multiply 16 by 123?   [#permalink] 12 Mar 2012, 00:00
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Simple Arithmetic Question: How do you multiply 16 by 123?

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