Question

3. Find the cube root of the following
perfect cubes using estimation.
a) 2,74,625
b) 39,304
c) 4,38,976
d) 1,03.823
e) 3,28,509
f) 778,688
4. What should be multiplied to the
following numbers to make them a
perfect cube?
a) 2,200 b) 1,340
c) 3,378​

Answer 1

Answer:

3 :-

a) 65

b)34

c)76

d)4.7

e)69

f)92

Answer 2

Answer:

Correct option is

C

34

Step I: Form groups of 3 starting from right most digit of 39304, i.e.

39

304

.

Then, the two groups are 39 and 304.

Here, 39 has 2 digit and 304 has 3 digit.

Step II: Take 304.

Digit in unit place =4.

Therefore, we take one's place of required cube root as 4 ....[Since, 4

3

=64].

Step III: Now, take the other group 39.

We know, 3

3

=27 and 4

3

=64.

Here, the smallest number among 3 and 4 is 3.

Therefore, we take 3 as ten's place.

∴

3

39304

=34.

Hence, option C is correct.

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