- Which of the following numbers are not prefect cubes?
(ii) 128
(iii) 1000
(iv) 100
(v) 46656
2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube.
(i) 243
(ii) 256
(iii) 675
(ii) 128
(iii) 1000
(iv) 100
(v) 46656
2. Find the smallest number by which each of the following numbers must be multiplied to obtain a perfect cube.
(i) 243
(ii) 256
(iii) 675
Answers!
Q.1 (i) ans = 216 =2×2×2×3×3×3 yes 216 is perfect cube.
(ii)ans=128=2×2×2×2×2×2×2 No 128 is not perfect cube.
(iii) 1000= 2×2×2×5×5×5 yes 1000 is a peefect cube
(iv) 100= 2×2×5×5 so, 100 is not a perfect cube.
(v) 46656= 2×2×2×2×2×2×3×3×3×3×3×3 yes 46656 is aperfect cube
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Answer the question...
Q.1 (i) ans = 216 =2×2×2×3×3×3 yes 216 is perfect cube.
(ii)ans=128=2×2×2×2×2×2×2 No 128 is not perfect cube.
(iii) 1000= 2×2×2×5×5×5 yes 1000 is a peefect cube
(iv) 100= 2×2×5×5 so, 100 is not a perfect cube.
(v) 46656= 2×2×2×2×2×2×3×3×3×3×3×3 yes 46656 is aperfect cube
(ii)ans=128=2×2×2×2×2×2×2 No 128 is not perfect cube.
(iii) 1000= 2×2×2×5×5×5 yes 1000 is a peefect cube
(iv) 100= 2×2×5×5 so, 100 is not a perfect cube.
(v) 46656= 2×2×2×2×2×2×3×3×3×3×3×3 yes 46656 is aperfect cube
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