MATH 20
EXTRA PRACTICE/4.1-4.3
Name_________________________________
Identify the digit with the given place value.
1) 132.835
thousandths
2) 0.28852
ten-thousandths
3) 0.137325
tenths
Write the decimal number that has the specified place values.
4) 7 tens, 4 tenths, 9 hundreds, 8 ones, 2 hundredths
5) 6 tenths, 5 ten-thousandths, 8 hundredths, 6 hundreds
6) 6 tens, 3 ten-thousands, 1 hundredths, 5 ones, 6 ten-thousandths
Write the decimal as a fraction or mixed number in lowest terms.
7) 0.048
8) 13.96
9) 0.58
Write the decimal in words.
10) 0.8531
11) 9.8
12) 7.00294
Write the decimal in numbers.
13) Six and five hundred sixteen ten-thousandths
14) Ten and six tenths
15) Eight and seventeen hundredths
1
Solve the problem.
16) An electrician has to choose different types of wire for different applications. The size of the diameter of the
wire is inversely related to the gauge of the wire. The chart below shows some different gauges of wire and
their approximate diameters. Use the chart to answer the question.
What is the gauge of the wire with a diameter of
63
inch?
1000
17) Suppose your job is to take phone orders for computer parts. Use the table below to answer the following
questions. Write the correct part number that matches what you hear the customer say on the phone.
Part
Size in
Number
centimeters
A
0.1
B
0.01
C
0.19
D
1.1
E
1.19
F
1.09
G
1.01
H
0.91
I
0.001
"Do you have that part in 1 and 1 tenths centimeters?"
2
18) Suppose your job is to take phone orders for machine parts. Use the table below to answer the following
questions. Write the correct part number that matches what you hear the customer say on the phone.
Part
Size in
Number
centimeters
A
0.7
B
0.07
C
0.79
D
1.7
E
1.79
F
1.09
G
1.07
H
0.97
I
0.007
"Please send the 7-hundredths centimeter part."
Round the number to the place indicated.
19) Round to the nearest hundredth: 8.7288
20) Round to the nearest one: 713.674
21) Round to the nearest one: 82.7
22) Round to the nearest tenth: 1.6245
You are on a shopping trip. The store will round the amount you pay for each item to the nearest cent. Find the amount
you will pay.
23) Printer ribbons are 6 ribbons for $29.09, so one ribbon is $4.8483. You pay:
24) Compact disks are 3 for $43.31, so one CD is $14.4367. You pay:
25) Laundry detergent is 2 bottles for $3.13, so one bottle is $1.5650. You pay:
26) 35 mm film is 4 rolls for $34.15, so one roll is $8.5375. You pay:
In order to prepare her budget, Sue gathers receipts for all major expenses she has had over the last month. Round the
figure to the nearest dollar.
27) Tuition payment, $8866.84
28) Donations to charity, $289.29
29) Books, $237.69
3
30) Car payment, $313.26
Round the money amount to the specified place.
31) $3999.64 to the nearest dollar
32) $2.186 to the nearest cent.
33) $0.9953 to the nearest cent
34) $64.21 to the nearest dollar
Round to the indicated place.
35) A student has a test average of 82.15. Round this result to the ones place.
36) The Dow Jones Industrial Average increased by 2.364% last week. Express this change rounded to the nearest
tenth.
37) The Great Pyramid of Khufu in Egypt is 137.37 meters tall. Round this measurement to the nearest tenth of a
meter.
Find the sum.
38) 1.5771 + 2.5778
39) 477.05 + 0.9992 + 43 + 6.19213 + 57.417
40) 0.115 + 3.9
41) 96.591 + 29.2 + 9.054 + 44.63
Find the difference.
42) 7.655 - 4.964
43) 14.850 - 3.854
44) Subtract 6.178 from 7364.42.
45) 15.99 - 13.454
Use front-end rounding to round each number. Then, add or subtract the rounded numbers to get an estimated answer.
Finally, find the exact answer.
46) estimate
exact
5.3
3.6425
+
+ 6.5296
4
47) estimate
+
48) estimate
+
exact
41.76
14.9
+ 9.2
exact
3263.36
5332.43
+ 6901.07
Use your estimation skills to pick the most reasonable answer. Do not solve the problem.
49) 319.61 - 318.13
A) 148
B) 1.48
C) 14.8
50) 9 - 8.734
A) 0.0266
B) 2.66
C) 0.266
First, use front-end rounding to round each number and estimate the answer. Then, find the exact answer.
51) John is taking a road to Calistoga. He has already driven 72.19 kilometers. If the entire distance to Calistoga is
148 kilometers, how much further must John drive?
52) Tran's subtotal at Scramble's Electronics is $337.99. The sales tax on these items is $24.86. What was Tran's total
bill?
53) Ray's gross pay is $337.17 per week. $54.68 is withheld for federal income tax, $25.10 for FICA tax, and $11.32
for other deductions. Find his net pay.
The table shows Jose's expenses for one month. Use the table to answer the question.
54) How much did Jose spend for food, car repairs, and utilities?
Monthly Expenses
Rent
$448
Food
$155
Car repairs
$105.91
Utilities
$69.90
Phone (long distance) $66.18
Phone (local)
$25.79
Drumming lessons
$99
Entertainment
$63.93
5
55) What were Jose's total expenses for the month?
Monthly Expenses
Rent
$441
Food
$197
Car repairs, gas
$105.95
Utilities
$52.48
Phone (long distance) $70.13
Phone (local)
$29.34
Drumming lessons
$115
Entertainment
$65.55
Find the perimeter of (distance around) the given figure by adding the lengths of the sides.
56)
2 in.
1.4 in.
0.82 in.
0.93 in.
1.889 in.
1.6 in.
2.174 in.
57)
5.5 cm
2.5 cm
4.59 cm
7 cm
2.29 cm
6
Find the missing measurement in the figure.
58)
a = 0.84 b = 0.2 cm c = 2 cm
59)
a = 1.58 in. b = 1.58 in. c = 5.59 in.
7
60)
a = 1.1 meters b = 1.1 meters c = 3.9 meters
8
Answer Key
Testname: M20_4.1-4.3
1)
2)
3)
4)
5)
6)
5
5
1
978.42
600.6805
30,065.0106
6
7)
125
8) 13
9)
24
25
29
50
10) Eight thousand five hundred thirty-one ten-thousandths
11) Nine and eight tenths
12) Seven and two hundred ninety-four hundred-thousandths
13) 6.0516
14) 10.6
15) 8.17
16) 14 gauge
17) D
18) B
19) 8.73
20) 714
21) 83
22) 1.6
23) $4.85
24) $14.44
25) $1.57
26) $8.54
27) $8867
28) $289
29) $238
30) $313
31) $4000
32) $2.19
33) $1
34) $64
35) 82
36) 2.4%
37) 137.4 m
38) 4.1549
39) 584.65833
40) 4.015
41) 179.475
42) 2.691
43) 10.996
44) 7358.242
45) 2.536
46) Estimate: 16; exact: 15.4721
9
Answer Key
Testname: M20_4.1-4.3
47) Estimate: 59; exact: 65.86
48) Estimate: 15,000; exact: 15,496.86
49) B
50) C
51) Estimate: 30 kilometers; exact: 75.81 kilometers
52) Estimate: $320; exact: $362.85
53) Estimate: $210; exact: $246.07
54) 330.81
55) 1076.45
56) 10.813 in.
57) 21.88 cm
58) z = 0.96 cm
59) z = 2.43 in.
60) z = 1.7 meter(s)
10