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Shruti Dube

· started a discussion

· 1 Months ago

cube root (Question: 193742.0 )

how we can calculate the cube root of 4998 by short trick

Question:
The volume of a solid hemispherical object is 10472 cm3. its total surface area is –
Options:
A) 2757.008 cm2 
B) 2775.008 cm2
C) 2575.008 cm2 
D) 2600.008 cm2 
Solution:
Ans: (a)


Knowledge Expert

· commented

· 1 Months ago

Dear Student,

To simplify the cube root/ square root of such numbers you need to remember first 25 numbers square root and cube root.

Number – Square - Cube
1 1 1
2 4 8
3 9 27
4 16 64
5 25 125
6 36 216
7 49 343
8 64 512
9 81 729
10 100 1000
11 121 1331
12 144 1728
13 169 2197
14 196 2744
15 225 3375
16 256 4096
17 289 4913
18 324 5832
19 361 6859
20 400 8000
21 441 9261
22 484 10648
23 529 12167
24 576 13824
25 625 15625


Cube root of 4998:

Now, see the table, check which number’s cube is near about of this number i.e. 17, so 17. Something will be the cube root of 4998 viz. 17.1

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All the Best.
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pradeep

· commented

· 1 Months ago

how????
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