Everyday Math Grade 4 – Lesson 3.9 Parentheses in Number Sentences Copyright © 2010 Kelly Mott

Math Boxes Lesson 3.9 Page 69

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Everyday Math Grade 4 – Lesson 3.9 Parentheses in Number Sentences Copyright © 2010 Kelly Mott

PART 1: REVIEW Copyright © 2010 Kelly Mott

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: = 14 Number Sentences Copyright © 2010 Kelly Mott

A number sentence can be TRUE. EXAMPLE 5 x 2 = 10 Number Sentences Copyright © 2010 Kelly Mott

A number sentence can be FALSE. EXAMPLE = 6 Number Sentences Copyright © 2010 Kelly Mott

= 19 Circle: True or False Is it TRUE or FALSE? Copyright © 2010 Kelly Mott 157 > 159 Circle: True or False

17 > 5 x 4 Circle: True or False Is it TRUE or FALSE? Copyright © 2010 Kelly Mott 18/9 = 3 Circle: True or False

Let’s try some with our keypads. Tell if each number sentence is TRUE or FALSE. Number Sentences Copyright © 2010 Kelly Mott

Unit 3 Review Mrs. Gregory

= 28 1.True 2.False

5 * 3 =15 1.True 2.False

46,568 > 5,003,456 1.True 2.False

> True 2.False

= True 2.False

5 x 7 = True 2.False

17 – = 13 1.True 2.False

9 x 6 > 81/9 1.True 2.False

57 – 7 < 8 x 7 1.True 2.False

PART 2: SOLVE WITH PARENTHESES Copyright © 2010 Kelly Mott

Some number sentences use PARENTHESES. EXAMPLE (6 – 2) + 4 = 8 Number Sentences Copyright © 2010 Kelly Mott

To solve these, you must do what’s in the PARENTHESES first. (6 – 2) + 4 = 8 Number Sentences 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: perations/orderofoperations/ Copyright © 2010 Kelly Mott

TIP TO REMEMBER: Please Excuse My Dear Aunt Sally Copyright © 2010 Kelly Mott 1.PARENTHESES 2.EXPONENTS 3.MULTIPLY 4.DIVIDE 5.ADD 6.SUBTRACT

A.(28 - 6) + 9 = ______________ B.28 - (6 + 9) = ______________ Number Sentences Copyright © 2010 Kelly Mott

C. (10 - 3) x 2 = ______________ D (3 x 2) = ______________ Number Sentences Copyright © 2010 Kelly Mott

E. (15 + 2) x 5 = ______________ F (2 x 5) = ______________ Number Sentences Copyright © 2010 Kelly Mott

G. (4 x 8) - 4 = ______________ H. 4 x (8 - 4) = ______________ Number Sentences Copyright © 2010 Kelly Mott

PART 3: TRUE or FALSE with PARENTHESES Copyright © 2010 Kelly Mott

Now let’s try some with parentheses and tell whether they are TRUE or FALSE. Number Sentences Copyright © 2010 Kelly Mott

A.(2 x 2) + 10 = 14 True or False B. 10 = 4 + (1 x 2) True or False Number Sentences Copyright © 2010 Kelly Mott

C. (10 - 3) x 4= 21 True or False D. 18 = (6 + 3) x 2 True or False Number Sentences Copyright © 2010 Kelly Mott

PART 4: MAKE THE SENTENCE TRUE Copyright © 2010 Kelly Mott

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 = 10 TIPS FOR SOLVING: Copyright © 2010 Kelly Mott

8 x = 36 MAKE THE SENTENCE TRUE Copyright © 2010 Kelly Mott 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.

25 = 5 x MAKE THE SENTENCE TRUE Copyright © 2010 Kelly Mott 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 =10 MAKE THE SENTENCE TRUE Copyright © 2010 Kelly Mott 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.

43 = 9 x 5 – 2 MAKE THE SENTENCE TRUE Copyright © 2010 Kelly Mott 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.

28 ÷ 7 x 4 = 16 MAKE THE SENTENCE TRUE Copyright © 2010 Kelly Mott 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.

12 ÷ 2 x 3 = 2 MAKE THE SENTENCE TRUE Copyright © 2010 Kelly Mott 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.

Does this make sense? Copyright © 2010 Kelly Mott

a

HOMEWORK Page 68 Copyright © 2010 Kelly Mott

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. TIPS Copyright © 2010 Kelly Mott