Exercise: Square Root And Cube Root

Questions for: Square Root And Cube Root

The square root of 64009 is:
A:
253
B:
347
C:
363
D:
803
Answer: A 
   2|64009( 253
    |4
    |----------
  45|240
    |225
    |----------
 503|  1509
    |  1509
    |----------
    |     X
    |----------

64009 = 253.

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How many two-digit numbers satisfy this property.: The last digit (unit's digit) of the square of the two-digit number is 8 ?
A:
1
B:
2
C:
3
D:
None of these
Answer: D
A number ending in 8 can never be a perfect square.
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3 - 1 2 simplifies to:
3
A:
3
4
B:
4
3
C:
4
3
D:
None of these
Answer: C

3 - 1 2 = (3)2 + 1 2 - 2 x 3 x 1
3 3 3

= 3 + 1 - 2
3

= 1 + 1
3

= 4
3

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0.0169 x ? = 1.3

A:
10
B:
100
C:
1000
D:
None of these
Answer: B

Let 0.0169 x x = 1.3.

Then, 0.0169x = (1.3)2 = 1.69

x = 1.69 = 100
0.0169

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625 x 14 x 11 is equal to:
11 25 196
A:
5
B:
6
C:
8
D:
11
Answer: A
Given Expression = 25 x 14 x 11 = 5.
11 5 14
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