Job Information Level 2: Lesson 5 Working with Prefixes and Powers of 10

Question 1

When the prefix ? is used, it means multiply the number by 1,000.

a.
deka

b.
hecto

c.
kilo

d.
milli

Answer 1

kilo

Question 2

When the prefix milli is used, it means multiply the number by ? .

a.
0.1

b.
0.01

c.
0.001

d.
1,000

Answer 2

0.001

Question 3

When converting from a whole number to a prefixed number, ? the whole number by the value of the ? .

a.
add / prefix

b.
divide / prefix

c.
multiply / prefix

d.
multiply / suffix

Answer 3

divide / prefix

Question 4

When converting from one prefixed number to another, ? the number by the value of the first prefix and ? that value by the value of the prefix to which you are converting.

a.
divide / add

b.
divide / multiply

c.
multiply / add

d.
multiply / divide

Answer 4

multiply / divide

Question 5

Which of the numbers below correctly describes 1,250 volts?

a.
0.00125 MV

b.
0.125 MV

c.
1.25 MV

d.
1,250 MV

Answer 5

0.00125 MV

Mega is 10^6

Question 6

Which of the numbers below correctly describes 17 mA?

a.
0.17 mA

b.
0.17 A

c.
0.0017 kA

d.
17,000 µA

Answer 6

17,000 µA

Question 7

Which of the numbers below correctly describes 63.45 Mhz?

a.
0.06345 Ghz

b.
63,450 khz

c.
Both a and b

d.
None of the above

Answer 7

Both a and b

Question 8

Which of the numbers below correctly describes 30.25 ns?

a.
0.03025 µSec

b.
0.03025 mSec

c.
3.0250 pSec

d.
302,500 pSec

Answer 8

0.03025 µSec

Question 9

Which of the numbers below correctly describes 5,000 µf?

a.
0.005 farad

b.
0.05 farad

c.
50 mf

d.
5 farad

Answer 9

0.005 farad

Question 10

Which of the numbers below correctly describes 4.7 h?

a.
4,700 mh

b.
4,700,000 ph

c.
0.47 kh

d.
4,700

Answer 10

4,700 mh

Question 11

Which of the numbers below correctly describes 25 A?

a.
0.025 kA

b.
0.25 kA

c.
25,000 µA

d.
2,500 mA

Answer 11

0.025 kA

Question 12

Match the following powers of 10 to the correct units.

1 × 100
1 × 101
1 × 102
1 × 103
1 × 106
1 × 10-3

Answer 12

unit, deka, hecto, kilo, mega, milli

Question 13

Multiply the following using powers of 10. Change to powers of 10 where necessary. Show answers in decimal form.

(6 × 106) × (5 × 103)

a.
3,000,000,000

b.
30,000,000,000

c.
300,000,000,000

d.
3,000,000,000,000

Answer 13

30,000,000,000

(6 × 5) × 106 + 3
30 × 109 giga
= 30,000,000,000

Question 14

Multiply the following using powers of 10. Change to powers of 10 where necessary. Show answers in decimal form.

(4.5 × 10-3) × (2 × 104)

a.
90

b.
900

c.
9,000

d.
90,000

Answer 14

90

(4.5 × 2) × 10^(−3 + 4)
9× 101 deka = 90

Question 15

Divide the following using powers of 10.

(6 × 106) ÷ (5 × 103)

a.
120

b.
1,200

c.
12,000

d.
120,000

Answer 15

1,200

(6 ÷ 5) × 10^(6− 3)
1.2 × 103 kilo
= 1,200

Question 16

Divide the following using powers of 10.

(4.5 × 10^−3) ÷ (2 × 10^3)

a.
0.000000225

b.
0.00000225

c.
0.0000225

d.
0.000225

Answer 16

0.00000225

(4.5 ÷2) × 10^(−3− 3)
2.25 × 10−6 micro
= 0.00000225

Question 17

Add the following using powers of 10.

(6.65 × 10^3) + (5.35 × 10^3)

a.
120

b.
1,200.0

c.
12,000.0

d.
120,000.0

Answer 17

12,000.0

(6.65 + 5.35) × 10^3
12 × 10^3 kilo
= 12,000

Question 18

Add the following using powers of 10.

(3.455 × 10^6) + (5.45 × 10^5)

a.
4,000.0

b.
40,000.0

c.
400,000.0

d.
4,000,000.0

Answer 18

4,000,000.0

Question 19

Subtract using powers of 10.

(6.65 × 10^4) − (5.35 × 10^3)

a.
611.5

b.
6,115.0

c.
61,150.0

d.
611,500.0

Answer 19

61,150.0