Question

Find the cube root of the74088using estimation​

Answer 1

Answer:

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Finding cube root by estimation

• Make group of 3 digit, starting from right.
• The unit digit of cube root will be. Unit digit of cube root of 857375 = Unit digit of cube root of 375. Since 375 ends in 5, it's cube root will end in 5. (As 5 3 = 12 5 , 1 5 3 = 337 5 )
• Now, for second group. 8 5 7. We note that. 9 3 = 729. & 10 3 = 1000. So, 729 < 857 < 1000.

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Answer 2

Step-by-step explanation:

Find the cube root of -175616.

Solution :

We know that ∛-175616 = - ∛175616

The number is even so its cube root has to an even number.

Make two groups ---> 175616

First group 616 ---> unit digit is 6 so unit digit of cube root will be 6

(see the above table).

Second Group 175 -----> it lies between 5 3 =125 and 6 3 = 216 .

So take the smaller number 5 as ten's place.