Finding Unit Digit - MCQ Test


5 Questions MCQ Test UPSC Prelims Paper 2 CSAT - Quant, Verbal & Decision Making | Finding Unit Digit - MCQ Test


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This mock test of Finding Unit Digit - MCQ Test for UPSC helps you for every UPSC entrance exam. This contains 5 Multiple Choice Questions for UPSC Finding Unit Digit - MCQ Test (mcq) to study with solutions a complete question bank. The solved questions answers in this Finding Unit Digit - MCQ Test quiz give you a good mix of easy questions and tough questions. UPSC students definitely take this Finding Unit Digit - MCQ Test exercise for a better result in the exam. You can find other Finding Unit Digit - MCQ Test extra questions, long questions & short questions for UPSC on EduRev as well by searching above.
QUESTION: 1

Find the unit digit of (7493263)x(15129)

Solution:

Answer: c)7

Solution:
The given product is (7493263)x(15129)
Required unit digit = the unit digit of(3263)x(129) ...(1)
In the value of 3 to the power 4, we have the unit digit as 1.
so, we can rewrite (3263) = [3(4x65 + 3)] = [(34)65] x (33)
Then from eqn(1),
The unit digit of(3263)x(129) = The unit digit of[(34)65] x (33) x 129
= The unit digit of[165] x 27 x 1
= The unit digit of 1 x 7 x 1 = 7
Hence, the answer is 7.

QUESTION: 2

Find the unit digit of 634262 + 634263

Solution:

Given that 634262 + 634263
= 634262(1 + 634)
= (634262) x 635
The unit digit of (634262) x 635 = the unit digit of (4262 x 5)
We know that, the unit digit of 4 to the power of any odd number is 4 and the unit digit of 4 to the power of any even number is 6.
Then the unit digit of (4262 x 5) = unit digit of(6 x 5) = 0

QUESTION: 3

The digit in the unit place of the number represented by (795 * 358) is

Solution:
QUESTION: 4

What is the units digit of  5745?

Solution:
QUESTION: 5

What is the units digit of  3961?

Solution:

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