Writing Expressions and Equations

1
Writing ExpressionsandEquations
2
Word Clues

• Often words and phrases suggest addition,
  subtraction, multiplication, and division. You
  just need to know those words!
• Take notes!! You are about to receive your clue
  words!

3
ADDITION CLUES

• Plus
• Sum
• More than
• Increased by
• In all

4
SUBTRACTION CLUES

• Minus
• Difference
• Less than
• Less
• Decreased by

5
MULTIPLICATION CLUES

• Times
• Produce
• Multiplied
• Twice
• Each

6
DIVISION CLUES

• Divided
• Quotient
• Per
• Separate

7
Writing phrases as algebraic expressions

• Five dollars less than Jennifer earned
• Less than is a subtraction clue
• When less than is used, the 2nd item is always
  written first.
• Jennifer is the 2nd item we dont know her
  earnings, so use a variable.

8
Writing phrases as algebraic expressions

• Five dollars less than Jennifer earned
• Since less than is subtraction and the 2nd item
  goes first, the beginning of the expression would
  like this
• j -

9
Writing phrases as algebraic expressions

• Five dollars less than Jennifer earned
• Now write the rest of the expression to complete
  the phrase!
• j - 5

10
Writing phrases as algebraic expressions

• Twice as many tomatoes as last year
• Whats our clue word? TWICE
• Do we know how many tomatoes there were last
  year? NO
• So, what should be used for the tomatoes? VARIABLE

11
Writing phrases as algebraic expressions

• Twice as many tomatoes as last year
• What does twice mean? TWO TIMES
• When a coefficient and a variable are being
  multiplied, remember how to write them!!
• SMASHED TOGETHER LIKE PBJ

12
Writing phrases as algebraic expressions

• Twice as many tomatoes as last year
• 2t

13
Writing phrases as algebraic expressions

• 3 more runs than the Pirates scored
• Word Clue MORE
• Variable Clue Pirates undefined
• 3 p

14
Writing phrases as algebraic
equations

• The ONLY difference between expressions and
  equations
• the word IS

15
Writing phrases as algebraic
equations

• Five more than a number is 20.
• Word Clue MORE THAN
• Variable Clue NUMBER IS UNDEFINED
• Equation Clue IS

16
Writing phrases as algebraic
equations

• Five more than a number is 20.
• Write it as you read it!!!
• 5 n 20

17
Writing phrases as algebraic
equations

• Three times Jacks age equals 12.
• Word Clue TIMES
• Variable Clue JACKS AGE UNDEFINED
• Equation Clue EQUALS

18
Writing phrases as algebraic
equations

• Three times Jacks age equals 12.
• Write it as you read it!!
• 3j 12

19
Writing phrases as algebraic
equations

• Ten less a number is 8
• Word Clue LESS
• Variable Clue NUMBER IS UNDEFINED
• Equation Clue IS
• Notice that it is only LESS, not less than. This
  means to write it as you read it!!

20
Writing phrases as algebraic
equations

• Ten less a number is 8
• 10 n 8

21
Writing phrases as algebraic
equations

• Seven less than a number is 6
• Word Clue LESS
• Variable Clue NUMBER IS UNDEFINED
• Equation Clue IS
• Notice that it is LESS THAN, not less. This means
  to write the 2nd item first!!

22
Writing phrases as algebraic
equations

• Seven less than a number is 6
• n 7 6

23
Writing phrases as algebraic equations and
expressions

• You try these!
• Eight more than x
• The sum of a number and four is -9
• Nine less than t
• Twice a number equals -10
• A number less 4 is 12.
• Five years older than Luis.
• A number divided by -12
• Twice as many oranges.
• A number less 6.
• -15 divided by some number.