FL.MA.6.A.3.1
Write and evaluate mathematical expressions that correspond to given situation.
Any letter can be
used as a variable
VocabularyVariable- A symbol usually a letter used to represent a number.
n+2
Algebraic Expressions- contain at least one variable and one expression with no equal sign.
Evaluate- Find the value of (or find the answer).
----------------------------------------------------------------------------------------------------------------------------------------REMEMBER-Order of Operations (PEMDAS)
Please
Excuse
My Dear
Aunt Sally
Parenthesis
Exponents
Multiply/Divide (whichever comes first)
Add/Subtract (whichever comes first)
4 + 32 x 2
Exponent first: 4 + 9 x 2
Multiply next: 4 + 18
Then add:
22
30 – 5(2 + 3)
Parenthesis first: 30 – 5(5)
Multiply next:
30 – 25
Then subtract:
5
4–2+6
Subtract first: 2 + 6
Then add:
8
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Try these- Evaluate each expression, if a = 4 and b = 2.
Example:
Evaluate 16+b if b=25.
1) a+8
16+b replace b with 25
16+25 add 16 and 25
=41
2)
a-b
3)
a∙b
4) 2a-5
6) 33 – (7 + 2) x 2
5) (4 + 2) ÷ 2 x 3
7). Admission to a fair is $7.00 per person, and each ride ticket costs
$2.00. The total cost for admission and t ride tickets is 7+2t. Find the
total cost for admission and 5 ride tickets.
Writing Expressions
Eight dollars more than Ryan earned
Words
Variable
Model
Let d represent the number of dollars Ryan
earned
Ryan’s
earnings
d
Expression
13
8
Try these- Write and evaluate each
8.
four times as many apples
9.
six years less than Tracey’s age
10. Sarita has twice as many ringtones as Dawn
11. Melinda goes bowling on Saturday afternoons for
$2.50 per game. She bowls three games and pays for
$2 shoe rental. Write and evaluate an expression to
represent the total cost Melinda pays.
8
The expression is d + 8.
12. One package of golf balls costs $28.00 and a package
of golf tees costs $20.00 Write an expression to find
the total cost of two packages of golf balls and three
packages of golf tees. Then find the total cost.
13.
17.
18.
14.
15.
20.
16.
21.
22.