Discussion of Question with ID = 003 under Basic-Simplification

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Question

What is 183 × 9?

A

1647.

B

1656.

C

1638.

D

1665.

Soln.
Ans: a

This is a multiplication by 9. Proceed like this: 183 × 9 = 183 × (10 - 1) = 183 × 10 - 183 = 1830 - 183 = 1647. Sometimes, the options can be ruled out by examining the units places, but for simpler cases these shortcuts will help you save time overall.


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