Copyright Goodheart-Willcox Inc. May not be reproduced or posted to a publicly accessible website.wwebsite.be Copyright Goodheart-Willcox Co., Inc. M
ay not be reproduced or posted to a public
accessible
Name
_________________________________
Date
_____________
Class
_____________
27
the indicated multiplication. Show all of your work. 1. Perform
7
× 3
‾
2. 5
× 4
‾
3. 8
× 6
‾
4. 9
×
5
‾
5. 3
× 6
‾
6. 35
× 3
‾
7. 47
× 4
‾
dollars
8. 66
×
7
‾
9. 94
×
5
‾
10. 24
× 8
‾
11. 41
× 23
‾
man-hours 12. 65
× 42
‾
13. 47
×
23
‾
14. 86
× 17
‾
pieces 15. 98
× 83
‾
in
Practice
Unit04.indd
27
Unit04.indd 27
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Inc. M
ay not be repr
oduced or p
osted to a
publicly ly accessible
we eb bs
si site
4. 9
×
5
‾
5. 3
× 6
‾
6.
×
‾
7. 47
× 4
‾
dollars
8. 66
×
7
‾
9. 94
×
5
‾
10. 24
× 8
‾
11. 41
× 23
‾
man n-hou
rs 12. 65
× 42
‾
13. 47
×
23 23
‾
14. 86
× 17 17
‾
piece es 1
5. 98
× 83 83
‾
in
Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. Cop yri ght Goodheart-Willcox Co., Inc. M ay not be reproduced or posted to a public ly accessible website.
Name _________________________________ Date _____________ Class _____________
39
Applications
Solve the following problems. Check your answers by multiplication. Show all of your work.
1. A piece of bar stock 84 inches long is cut into 7 pieces of equal size. What is
the length of the cut pieces?
________________________________________
2. If you receive $168 for working an 8-hour day, how much did you receive for
one hour?
________________________________________
3. Five studs are pressed into a plate 54 millimeters long. The holes are equally
spaced and the distance from the end of the plate to the center of the fi rst stud
is the same as the center-to-center distance between the studs. What is the
center-to-center distance between the studs (dimension x)?
X X X X X X
54 mm
Goodheart-Willcox Publisher
________________________________________
Unit05.indd 39 11/1/2017 9:44:34 AM
Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website.
51
Common
Fractions
SECTION
2
Unit 7.
Parts of a Fraction
Unit 8.
Proper Fractions, Improper Fractions,
and Mixed Numbers
Unit 9.
Least Common Denominators
Unit 10.
Adding Fractions
Unit 11.
Subtracting Fractions
Unit 12.
Multiplying Fractions
Unit 13.
Dividing Fractions
Key Terms
common denominator
denominator
equivalent fractions
fraction bar
improper fraction
invert
least common
denominator
lowest terms
mixed number
numerator
proper fraction
reducing
whole
Unit07
.indd 51
Unit07.indd 51
11/1
/2017 1:58:29 PM
Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website.
139
Multiplying
Decimal Fractions
UNIT
18
Objectives
Information in this unit will enable you to:
▪
Demonstrate how to multiply decimals.
▪
Describe how to easily multiply decimals by 10, 100, and 1,000.
Learning the Principles
Multiplying decimal fractions is very much like multiplying whole numbers, with
particular attention paid to place values and placement of the decimal point. Write
the numbers above one another, putting the number with the fewest digits on the
multiplier line. Start multiplication with the farthest digit to the right in the multiplier.
When the digits have been multiplied, the decimal point is placed in the product.
In the product line (the answer line), count the total number of digits to the right of
the decimal point in the multiplier and the multiplicand and insert a decimal point
at that position.
Example 18-1
4.25
× .3
‾ 1.275
There are two decimal places in the multiplicand and one in the multiplier in
the example above, so in this case the decimal point in the product is placed so that
there are three decimal places to the right of the decimal point.
If there is more than one digit in the multiplier, do additional rows of multipli-
cation, the same as you would for whole numbers.
Unit18.indd 139
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vi
Section Outlines list the units
from that section in sequence.
Key Terms list the key
terms to be learned in
the section.
Objectives clearly identify
the knowledge and skills
to be obtained when the
unit is completed.
Examples demonstrate the concept that
has just been presented, showing all the work
needed to solve a mathematical problem.
Applications extend your
learning and help you analyze
and apply knowledge.
Illustrations have been designed
to clearly and simply communicate
the specific topic.
Practice questions
allow you to demonstrate
knowledge, identification,
and comprehension of
unit material.
Features are student-focused learning tools designed
to help you get the most out of your studies. This visual
guide highlights the features designed for the textbook.
Features
of the Textbook