Vocab
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Lesson 6-1
Lesson 6-8
Associative Property
of Addition
bar diagram
? $ spent
3/10 12:21:18 AM u-s014
(2 + 5) + 1 = 2 + (5 + 1)
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Lesson 6-1
$3,295
$3,999
last year
this year
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Lesson 6-5
Commutative Property
of Addition
estimate
12 + 15 = 15 + 12
about $30
Lesson 6-1
Lesson 6-1
Identity Property
of A
Addition
ition
mental math
5+7+5=
10 + 7 = 17
Copyright © The McGraw-Hill Companies, Inc.
3+0=3
Lesson 6-1
Lesson 6-2
parentheses
(3 + 4) + 2= 3 + (4 + 2)
pattern
+
0
1
2
3
0
0
1
2
3
1
1
2
3
4
2
2
3
4
5
3
3
4
5
6
Ideas for Use
• During this school year, create a separate
stack of cards for key math verbs, such as
regroup. These verbs will help you in your
problem solving.
• Use a blank card to write this chapter’s
essential question. Use the back of the card to
write or draw examples that help you answer
the question.
A bar diagram is used to illustrate number
relationships.
The property which states that the grouping
of addends does not change the sum.
Jimena made $1,595 last year and $1,876
this year. Draw a bar diagram to show this
problem.
Write your own example to show this
property.
Sample drawing:
$3,471
$1,595
Sample answer:
$1,876
A number close to an exact value.
7 + (3 + 6) = (7 + 3) + 6
Describe when you might need an estimate.
The order in which two numbers are added
does not change the sum.
Sample answer: I might estimate
Complete the number sentence to show the
Commutative Property of Addition.
how much something costs so I
11 + 7 = 7 + 11
Ordering or grouping numbers so they are
easier to add in your head.
If you add zero to a number, the sum is the
same as the given number.
When might it be important to use mental
math at a store?
Replace the suffix -ity in identity with a new
suffix. Use it in a sentence.
Sample answer: When I want to
Sample answer: -ical; There is a set
know if I have enough money.
of identical twins in my class.
A set of numbers that follows a certain order.
Write your own pattern using numbers.
Symbols that are used to group numbers.
They show how to group operations in a
number sentence.
Sample answer: 3, 6, 9, 12
Use a dictionary to find the singular form of
parentheses.
parenthesis
Copyright © The McGraw-Hill Companies, Inc.
know if I have enough money.
Vocab
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Lesson 6-6
Lesson 6-6
reasonable
682
+ 17
699
regroup
680
+ 20
700
700 is a reasonable estimate.
Lesson 6-7
unknown
21 + 6 = unknown
Copyright © The McGraw-Hill Companies, Inc.
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+
18
=
+ 5 =
23
Ideas for Use
To use place value to exchange equal
amounts when renaming a number.
What is the prefix in regroup? What does it
mean?
re– ; The prefix re– means “again.”
• Use a blank card to write this chapter’s
essential question. Use the back of the card to
write or draw examples that help you answer
the question.
Within the bounds of making sense.
The prefix un- can mean “not.” What does the
word unreasonable mean?
If something is unreasonable,
then it doesn’t make sense.
A missing number, or the number to be
solved for.
Write an example of an unknown at the
beginning a number sentence.
Sample answer: = 388 + 45
Copyright © The McGraw-Hill Companies, Inc.
• During this school year, create a separate
stack of cards for key math verbs, such as
regroup. These verbs will help you in your
problem solving.