Page 77 - C:\Users\azizu\Documents\Flip PDF Professional\Matematics-Form-1-1\

Self Practice 3.2e

1. Find the value of each of the following using a calculator and give your answer
correct to two decimal places.



3
3
3
(a) 15 (b) –74 (c) 164.2 (d) 3 7 (e) 3 –1 2
9 5
How do you estimate the cube and cube root of a number?
CHAPTER
3
LEARNING
17 STANDARDS

Estimate the value of Estimate
(i) the cube of a number,

3
(a) 4.2 (b) 180 (ii) the cube root of
3
a number.

(a) 4.2 is between 4 and 5.
3
3
4.2 is between 4 and 5 , Scan the QR Code or
3
3
that is, 4.2 is between 64 and 125. visit https://goo.gl/
3
Thus, 4.2 ≈ 64 UxjF6c to open the
file Example 17_pdf
to learn about the
(b) 180 is between perfect cubes 125 and 216. estimation using
   number line.
3
3
3
180 is between 125 and 216,
3
that is, 
180 is between 5 and 6.

3
Thus, 180 ≈ 6
Self Practice 3.2f
1. Estimate the value of each of the following:
3
3
3
(a) 2.1 (b) (–9.6) (c) 19.7 (d) (– 43.2)
3
2. Estimate the value of each of the following:

3
3
3
3
–118
–26.8
(a) 7 (b)  (c)  (d) 
69
How do you solve problems?
LEARNING
STANDARDS
A sculptor carves a small cube from a wooden cube block Solve problems involving
that has a side length of 6 cm. If the volume of the remaining cubes and cube roots.
3
wooden block is 189 cm , find the length of the small cube
that is being removed.
66
Chapter 3

03 TB Math F1.indd 66 11/10/16 12:10 PM