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4. Cubes and Cube Roots
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Q6 of 76 Page 4

Multiply 210125 by the smallest number so that the product is a perfect cube. Also, find out the cube root of the product.

First we find out the prime factors of 210125,


210125 = 5 × 5 × 5 × 41 × 41


∵ one triples remained incomplete, hence 210125 is not a perfect cube.


We see that if we multiply the factors by 41, we will get 2 triples as 23 and 413.


And the product become:


210125 × 41 = 8615125 = 5 × 5 × 5 × 41 × 41 × 41


Cube root of product =


More from this chapter

All 76 →
4

Find the cube root of each of the following natural numbers:

(i) 343 (ii) 2744


(iii) 4913 (iv) 1728


(v) 35937 (vi) 17576


(vii) 134217728 (viii) 48228544


(ix) 74088000 (x) 157464


(xi) 1157625 (xii) 33698267

5

Find the smallest number which when multiplied with 3600 will make the product a perfect cube. Further, find the cube root of the product.

7

What is the smallest number by which 8192 must be divided so that quotient is a perfect cube? Also, find the cube root of the quotient so obtained.

8

Three numbers are in the ratio 1:2:3. The sum of their cubes is 98784. Find the numbers.

Questions · 76
4. Cubes and Cube Roots
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