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

A number sentence can be TRUE. EXAMPLE 5 x 2 = 10 Number Sentences

A number sentence can be FALSE. EXAMPLE = 6 Number Sentences

= 19 Circle: True or False Is it TRUE or FALSE? 157 > 159 Circle: True or False

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

Let’s try some of the following questions. Tell if each number sentence is TRUE or FALSE. Number Sentences

= 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

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

You have to follow the ORDER OF OPERATIONS: 1.PARENTHESES 2.EXPONENTS 3.MULTIPLY and DIVIDE 4.ADD or SUBTRACT

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

A.(28 - 6) + 9 = ______________ B.28 - (6 + 9) = ______________ Number Sentences

C. (10 - 3) x 2 = ______________ D (3 x 2) = ______________ Number Sentences

E. (15 + 2) x 5 = ______________ F (2 x 5) = ______________ Number Sentences

G. (4 x 8) - 4 = ______________ H. 4 x (8 - 4) = ______________ Number Sentences

Now let’s try some with parentheses and tell whether they are TRUE or FALSE. Number Sentences

A.(2 x 2) + 10 = 14 True or False B. 10 = 4 + (1 x 2) True or False Number Sentences

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

MAKE THE SENTENCE TRUE

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:

8 x = 36 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.

25 = 5 x 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 =10 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.

43 = 9 x 5 – 2 MAKE THE SENTENCE TRUE 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 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 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.