Page 12 - Math Course 1 (Book 1)

Order of Operations

Write a numerical expression for the verbal SHOPPING
phrase the difference of seventeen and six.
The Good Price Grocery Store advertises a special
A. 17 + 6 B. 17 – 6 on 2-liter bottles of soft drinks. The f rst bottle
C. 17 × 6 D. 17 ÷ 6 purchased is $1.50 and each bottle after that is
$1.20. Write and evaluate an expression for the
total cost when 8 bottles are purchased.
Answer
A. 1.50 + 8(1.20) = 11.10
B. 1.50 + 7(1.20) = 9.90
C. 2 + 1.50 + 1.20 + 8 = 12.70
D. 1.20 + 7(1.50) = 11.70

Answer

MO. 1 - L1b
Order of Operations: Order of operations

Evaluate Expressions B E M-D A-S

Brackets ( )
Vocabulary A-Z Exponents 3²
x /
Multiply and Divide
Let us learn some vocabulary Add and Subtract + -

Work from LEFT to RIGHT

Evaluate Multiply and Divide are done at the same time
LEFT to RIGHT.
f nd the value of a 1 + 2 the value is 3
numerical expression.
Add and Subtract are done at the same time LEFT
(5 - 2) x 7 the value is 21 to RIGHT

3 x 3 + 2 the value is 11
Order of operations
Remember: Expression Evaluation Operation
A value is how much a thing is worth
6 + 7 x 8 = 6 + 7 x 8 Multiplication
= 6 + 56 Add
= 62

16 ÷ 8 - 2 = 16 ÷ 8 - 2 Division
= 2 - 2 Subtraction
Order of Operations = 0
the order in which we evaluate a numerical
expression can change the answer. (25 - 11) x 3 = (25 - 11) x 3 Parentheses
= 14 x 3 Multiplication
3 x 3 + 2 = 42
3 x 3 + 2 = 9 + 2 = 11

3 x 3 + 2 = 3 x 5 = 15

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