Delightful Decimals and Perfect Percents: Games and Activities That Make Math Easy and Fun

117 Pages·2002·2.978 MB·English

by  Lynette Long

DELIGHTFUL
DECIMALS AND
PERFECT PERCENTS:
Games and Activities
That Make Math
Easy and Fun
Lynette Long
John Wiley & Sons, Inc.
D
E L I G H T F U L
D
E C I M A L S A N D
P P
E R F E C T E R C E N T S
A l s o i n t h e M a g i c a l M a t h s e r i e s
Dazzling Division
Fabulous Fractions
Marvelous Multiplication
Measurement Mania
M a g i c a l M a t h
D
E L I G H T F U L
D
E C I M A L S A N D
P P
E R F E C T E R C E N T S
G a m e s a n d A c t i v i t i e s
T h a t M a k e M a t h E a s y a n d F u n
L y n e t t e L o n g
J o h n W i l e y & S o n s , I n c .
This book is printed on acid-free paper.
Copyright © 2003 by Lynette Long. All rights reserved
Illustrations copyright © 2003 by Tina Cash-Walsh
Published by John Wiley & Sons, Inc., Hoboken, New Jersey
Published simultaneously in Canada
Design and production by Navta Associates, Inc.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by
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The publisher and the author have made every reasonable effort to ensure that the experiments and activities
in this book are safe when conducted as instructed but assume no responsibility for any damage caused or sus-
tained while performing the experiments or activities in the book. Parents, guardians, and/or teachers should
supervise young readers who undertake the experiments and activities in this book.
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ISBN: 0-471-21058-7
Printed in the United States of America
10 9 8 7 6 5 4 3 2 1
C o n t e n t s
I. The Magic of Decimals
and Percents 1
II. The Facts on Decimals 3
1 Scavenger Hunt 5
2 Name That Place! 8
3 Decimals on the Line 11
4 Roving Decimal Points 13
5 Decimal Dot-to-Dot 16
6 Dynamite Decimal Reduction 18
7 Batting It In 21
8 Slap Match 24
9 Decimals Forever 26
III. Adding and Subtracting Decimals 29
10 Dozens of Dollars 31
11 Dazzling Decimal Addition 34
12 Count Down 36
13 Overnight Delivery 38
14 Shopping Spree 39
15 Zeros Exchange 41
IV. Multiplying and Dividing
Decimals 43
16 Multiplication War 45
17 Inflation 47
18 Currency Exchange 50
19 Crack the Code 52
v
20 15-Second Division 55
21 Buckets of Change 58
22 Watch the Trends 60
V. The Facts on Percents 63
23 Percent Grids 65
24 Guessing Game 67
25 Scramble 70
26 Conversion Wheel 72
27 Colored Candy Magic 75
28 Juice Labels 79
29 Money Sleuth 82
VI. Percents in Everyday Life 85
30 From State to State 87
31 Here’s a Tip 89
32 Interested in Money? 92
33 Better Deal 95
34 Health Watch 97
35 Game of Chance 99
36 Commercial Time 103
VII. Wrap It Up! 105
37 Math Review Game 107
38 Problem Generator 110
39 Number Cross Puzzle 112
40 Math Libs 115
Decimals and Percents
Master Certificate 117
Index 119
vi
I
T M
H E A G I C O F
D
E C I M A L S A N D
P
E R C E N T S
Decimals and percents are
everywhere. If you go
to the grocery store, you’ll
find the cost of every-
thing expressed in deci-
mals. The weight of the
meat is also expressed in
decimals. And if there is
a sale on meat, it might
be expressed as a per-
cent. If you want to suc-
ceed at math and really
understand the world you live
in, you have to get to know deci-
mals and percents.
1
But what are decimals? Like fractions, decimals are numbers that repre-
sent part of a whole, but unlike fractions, decimals don’t use a fraction bar.
Instead they use a decimal point. Everything to the right of the decimal
point is less than zero, and everything to the left of the decimal point is
greater than zero. One thing that makes decimals easy to work with is that,
unlike fractions, you don’t have to find a common denominator to add or
subtract them.
You will use decimals and percents every day of your life. So you might as
well start practicing. Begin with the fun activities in this book and you’ll
soon be a master of decimals and percents. Then you can proudly display
the decimals and percents master certificate at the back of this book.
2
I I
T F
H E A C T S O N
D
E C I M A L S
In this section, you’ll learn all the basic facts
about decimals. You’ll learn how to read a
decimal and write one, how to change a
decimal to a percent, and, of course, how to
change a fraction to a decimal and a deci-
mal to a fraction. Last but not least, you’ll
learn what a repeating decimal is.
While learning, you’ll solve a
decimal dot-to-dot, check
out the stats of your
favorite baseball
team on the
Internet, and play
some fast-paced
games with your
friends.
3