The method I usually use:
10 x 123 = 1230
6 x 100 = 600
6 x 20 = 120
6 x 3 = 18
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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