Question

estimate the value of 80 to the nearest whole number​

Answer 1

Answer:

87 is the whole cube of 3 i thik it is the ans

Answer 2

Step-by-step explanation:

Estimating Square Roots for a non perfect square can be done quickly if you know perfect squares.

1.√80= ?

4<80<81

8²-80-9²

8<√80-9

81-80= 1 & 80-64-24

80 is more nearer to 81(=9²) (Subtract from 9 in square root calculation)

81 - 80

= 1

(note difference to nearest known perfect square)

No. of Non perfect squares between 8² and

9²= 2*8

=16

{No. of Non perfect squares between successive squares a² and b², (where b=a+1) =2*base of first no. = 2a}

•°• √80- 9 - (1/16) = 9 -0.0625= 8.9375(8.94)