Everyday Math Grade 4 – Lesson 3.10 Open Sentences Copyright © 2010 Kelly Mott.

Everyday MathGrade 4 – Lesson 3.10

Open Sentences

Math Boxes Lesson 3.10

Math Box 1:

Math Box 2:

Math Box 3:

Math Box 4:

Math Box 5:

Math Box 6

Everyday MathGrade 4 – Lesson 3.10

Open Sentences

PART 1: REVIEW

A number sentence is a short way of writing a mathematical expression.

EXAMPLEI could write:eight plus six equals fourteenor I could write it this way:8 + 6 = 14

Number Sentences

A number sentence can be TRUE.

EXAMPLE5 x 2 = 10

Number Sentences

A number sentence can be FALSE.

EXAMPLE6 - 2 = 6

Number Sentences

25 + 3 = 29

Circle:True or False

Is it TRUE or FALSE?

55 - 3 > 51

Circle:True or False

Some number sentences use PARENTHESES.

EXAMPLE(6 – 2) + 4 = 8

Number Sentences

To solve these, you must do what’s in the PARENTHESES first.

(6 – 2) + 4 = 8

Number Sentences

A. (16 - 6) x 2 = ______________

B. 16 - (6 x 2) = ______________

Number Sentences

C. (8 + 2) x 5 = ______________

D. 8 + (2 x 5) = ______________

Number Sentences

Sometimes you have to tell if a number sentence is TRUE or FALSE.

Number Sentences

A. (2 x 5) + 10 = 25 True or False

B. 10 = 4 + (3 x 2) True or False

Number Sentences

Sometimes you have to add PARENTHESES to make a number sentence true.

EXAMPLE 16 - 2 x 4 = 8

Number Sentences

16 - 2 x 4 = 8

MAKE THE SENTENCE TRUE

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.

5 x 7 - 5 = 30

CHECK LIST:

___ Do the math.

8 x 2 + 1 = 24

CHECK LIST:

___ Do the math.

12 ÷ 4 x 3 = 9

CHECK LIST:

___ Do the math.

PART 2: OPEN SENTENCES

A number sentence is open if it has a VARIABLE.

EXAMPLE12 + x = 15

Number Sentences

A VARIABLE is a letter or symbol that stands for a missing number.12 + x = 15

Number Sentences

To solve sentences with variables, oftentimes you will use the INVERSE operation.

Number Sentences

51 = n + 29

n = _______

Open Number Sentences

12 + b = 55

b = ________

33 = s + 24

s = _______

67 + y = 102

y = ________

17 = z - 8

z = _______

t - 9 = 14

t = ________

41 = k - 18

k = _______

f - 7 = 23

f = ________

18 = 2 * x

x = _______

4 * w = 24

w =________

18 = 2 * x

x = _______

4 * w = 24

w =________

77 = 7 * y

y = _______

5 * h = 60

h =________

7 = 21/x

x = _______

18/w= 9

w =________

6 = 24/s

s = _______

36/f= 12

f =________

x = 7 * 3

x = _______

8 * 8 = z

z =________

y = 21/3

y = _______

14/2= t

t =________

Does this make sense?

HOMEWORKPage 71

Everyday Math Grade 4 – Lesson 3.10 Open Sentences Copyright © 2010 Kelly Mott.

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