Everyday Math
Grade 4 – Lesson 3.9
Parentheses in Number
Sentences
Copyright © 2010 Kelly Mott
Math Boxes
Lesson 3.9
Page 69
Copyright © 2010 Kelly Mott
Math Box 1:
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Math Box 2:
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Math Box 3:
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Math Box 4:
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Math Box 5:
Copyright © 2010 Kelly Mott
Everyday Math
Grade 4 – Lesson 3.9
Parentheses in Number
Sentences
Copyright © 2010 Kelly Mott
PART 1:
REVIEW
Copyright © 2010 Kelly Mott
Number Sentences
A number sentence is a short way of writing a
mathematical expression.
EXAMPLE
I could write:
eight plus six equals fourteen
or I could write it this way:
8 + 6 = 14
Copyright © 2010 Kelly Mott
Number Sentences
A number sentence can be
TRUE.
EXAMPLE
5 x 2 = 10
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Number Sentences
A number sentence can be
FALSE.
EXAMPLE
6-2=6
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Is it TRUE or FALSE?
11 + 8 = 19
157 > 159
Circle:
Circle:
True or False True or False
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Is it TRUE or FALSE?
17 > 5 x 4
18/9 = 3
Circle:
Circle:
True or False True or False
Copyright © 2010 Kelly Mott
Number Sentences
Let’s try some with our
keypads. Tell if each
number sentence is TRUE
or FALSE.
Copyright © 2010 Kelly Mott
Unit 3 Review
Mrs. Gregory
15 + 3 = 28
1.True
2.False
se
0%
Fa
l
Tr
ue
0%
5 * 3 =15
1.True
2.False
se
0%
Fa
l
Tr
ue
0%
46,568 > 5,003,456
1.True
2.False
se
0%
Fa
l
Tr
ue
0%
30 + 2 > 45 -7
1.True
2.False
se
0%
Fa
l
Tr
ue
0%
96 + 4 = 100 - 0
1.True
2.False
se
0%
Fa
l
Tr
ue
0%
5 x 7 = 15 +20
1.True
2.False
se
0%
Fa
l
Tr
ue
0%
17 – 8 + 3 = 13
1.True
2.False
se
0%
Fa
l
Tr
ue
0%
9 x 6 > 81/9
1.True
2.False
se
0%
Fa
l
Tr
ue
0%
57 – 7 < 8 x 7
1.True
2.False
se
0%
Fa
l
Tr
ue
0%
PART 2: SOLVE
WITH
PARENTHESES
Copyright © 2010 Kelly Mott
Number Sentences
Some number sentences
use PARENTHESES.
EXAMPLE
(6 – 2) + 4 = 8
Copyright © 2010 Kelly Mott
Number Sentences
To solve these, you must
do what’s in the
PARENTHESES first.
(6 – 2) + 4 = 8
Copyright © 2010 Kelly Mott
You have to follow the
ORDER OF OPERATIONS:
1. PARENTHESES
2. EXPONENTS
3. MULTIPLY and DIVIDE
4. ADD or SUBTRACT
Copyright © 2010 Kelly Mott
Click on the link to watch
the Brain Pop Video:
http://www.brainpop.com/math/numbersando
perations/orderofoperations/
Copyright © 2010 Kelly Mott
TIP TO REMEMBER:
Please Excuse My Dear
Aunt Sally
1.
2.
3.
4.
5.
6.
PARENTHESES
EXPONENTS
MULTIPLY
DIVIDE
ADD
SUBTRACT
Copyright © 2010 Kelly Mott
Number Sentences
A. (28 - 6) + 9 = ______________
B. 28 - (6 + 9) = ______________
Copyright © 2010 Kelly Mott
Number Sentences
C. (10 - 3) x 2 = ______________
D. 10 - (3 x 2) = ______________
Copyright © 2010 Kelly Mott
Number Sentences
E. (15 + 2) x 5 = ______________
F. 15 + (2 x 5) = ______________
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Number Sentences
G. (4 x 8) - 4 = ______________
H. 4 x (8 - 4) = ______________
Copyright © 2010 Kelly Mott
PART 3: TRUE or
FALSE with
PARENTHESES
Copyright © 2010 Kelly Mott
Number Sentences
Now let’s try some with
parentheses and tell
whether they are TRUE or
FALSE.
Copyright © 2010 Kelly Mott
Number Sentences
A. (2 x 2) + 10 = 14
True or False
B. 10 = 4 + (1 x 2)
True or False
Copyright © 2010 Kelly Mott
Number Sentences
C. (10 - 3) x 4= 21
True or False
D. 18 = (6 + 3) x 2
True or False
Copyright © 2010 Kelly Mott
PART 4: MAKE
THE SENTENCE
TRUE
Copyright © 2010 Kelly Mott
TIPS FOR SOLVING:
• Circle the relationship symbol (= < >)
• Start with the side that has numbers and operations.
• Try parentheses around the first set of numbers and
operation.
• Do the math.
• See if it’s true.
• If not true, put parentheses around the next set of numbers
and try again.
2 x 3 + 4 = 10
Copyright © 2010 Kelly Mott
MAKE THE SENTENCE TRUE
8 x 2 + 20 = 36
CHECK LIST:
___ Circle the relationship symbol (= < >)
___ Start with the side that has numbers and operations.
___ Try parentheses around the first set of numbers and operation.
___ Do the math.
___ See if it’s true.
___ If not true, put parentheses around the next set of numbers and try again.
Copyright © 2010 Kelly Mott
MAKE THE SENTENCE TRUE
25 = 5 x 2 + 3
CHECK LIST:
___ Circle the relationship symbol (= < >)
___ Start with the side that has numbers and operations.
___ Try parentheses around the first set of numbers and operation.
___ Do the math.
___ See if it’s true.
___ If not true, put parentheses around the next set of numbers and try again.
Copyright © 2010 Kelly Mott
MAKE THE SENTENCE TRUE
5 x 7 - 5 =10
CHECK LIST:
___ Circle the relationship symbol (= < >)
___ Start with the side that has numbers and operations.
___ Try parentheses around the first set of numbers and operation.
___ Do the math.
___ See if it’s true.
___ If not true, put parentheses around the next set of numbers and try again.
Copyright © 2010 Kelly Mott
MAKE THE SENTENCE TRUE
43 = 9 x 5 – 2
CHECK LIST:
___ Circle the relationship symbols (= < >)
___ Start with the side that has numbers and operations.
___ Try parentheses around the first set of numbers and operation.
___ Do the math.
___ See if it’s true.
___ If not true, put parentheses around the next set of numbers and try again.
Copyright © 2010 Kelly Mott
MAKE THE SENTENCE TRUE
28 ÷ 7 x 4 = 16
CHECK LIST:
___ Circle the relationship symbol (= < >)
___ Start with the side that has numbers and operations.
___ Try parentheses around the first set of numbers and operation.
___ Do the math.
___ See if it’s true.
___ If not true, put parentheses around the next set of numbers and try again.
Copyright © 2010 Kelly Mott
MAKE THE SENTENCE TRUE
12 ÷ 2 x 3 = 2
CHECK LIST:
___ Circle the relationship symbol (= < >)
___ Start with the side that has numbers and operations.
___ Try parentheses around the first set of numbers and operation.
___ Do the math.
___ See if it’s true.
___ If not true, put parentheses around the next set of numbers and try again.
Copyright © 2010 Kelly Mott
Does this make sense?
Copyright © 2010 Kelly Mott
a
Copyright © 2010 Kelly Mott
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HOMEWORK
Page 68
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TIPS
• Circle the relationship symbol (= < >)
• Start with the side that has numbers and operations.
• Try parentheses around the first set of numbers and
operation.
• Do the math.
• See if it’s true.
• If not true, put parentheses around the next set of
numbers and try again.
Copyright © 2010 Kelly Mott