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Grade: 8,    Subject: Math,    Topic: Number and Number Sense Negative exponents and manipulation
Question 1:
Which of the following is better suited for the use of negative exponents?

Size of balls in centimeter.Height of buildings in meter.

Size of plant cells in meter.Length of earth worms in inches.
 
Question 2:
What is the value of the following expression?

3.23 × 10 −4

0.00032332,300

0.3230.0000323
 
Question 3:
Represent 0.000005235 in scientific notation.

5.235 × 10 −95,235 × 10 −6

5.235 × 10 −65.235 × 10 −5
 
Question 4:
Convert 0.00000000895 Meter into scientific notation.

8,95 × 10 −11 Meter8.95 × 10 −9 Meter

8.95 × 10 −10 Meter89.5 × 10 −9 Meter
 
Question 5:
9.67 × 10 −7   −   2.67 × 10 −7   =   ?

7.0 × 10 −07.67 × 10 −7

7.0 × 10 −711.0 × 10 −8
 
Question 6:
2.22 × 10 −11   +   2.22 × 10 −11   =   ?

4.44 × 10 −114.44 × 10 −22

2.22 × 10 −222.22 × 10 −10
 
Question 7:
Size of a plant cell is 5.00 × 10 −7 meter. If 20 such cells are placed in a line; how long line will they make?

1.00 × 10 −6 meter1.00 × 10 −5 meter

20.00 × 10 −5 meter5.00 × 10 −5 meter
 
Question 8:
Tim coated a 1.0 × 10 −4 m thick layer of reflective material, which was ten times thicker then his professor wanted. What thickness of the reflective material did the professor want?

1.0 × 10 −5 m1.0 × 10 −4 m

1.0 × 10 −6 m11.0 × 10 −5 m
 
Question 9:
(4 × 10 −4)  ×  10,000  =  ?

4 × 10 −34 × 10 2

4 × 10 −14
 
Question 10:
(4 × 10 −4)  ÷  1,000  =  ?

4,000 × 10 −74 × 10 −8

4 × 10 −74 × 10 −6
 
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