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## PowerPoint Slideshow about 'Writing Expressions and Equations' - amelie

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Presentation Transcript

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!

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 don’t know her earnings, so use a variable.

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 -

Writing phrases as algebraic expressions

Five dollars less than Jennifer earned

- Now write the rest of the expression to complete the phrase!

j - $5

Writing phrases as algebraic expressions

Twice as many tomatoes as last year

- What’s our clue word? TWICE
- Do we know how many tomatoes there were last year? NO
- So, what should be used for the tomatoes? VARIABLE

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 PB&J

Writing phrases as algebraic expressions

3 more runs than the Pirates scored

- Word Clue: MORE
- Variable Clue: Pirates undefined

3 + p

Writing phrases as algebraic equations

- The ONLY difference between expressions and equations:

the word: IS

Writing phrases as algebraic equations

Five more than a number is 20.

- Word Clue:MORE THAN
- Variable Clue:NUMBER IS UNDEFINED
- Equation Clue:IS

Writing phrases as algebraic equations

Five more than a number is 20.

Write it as you read it!!!

5 + n = 20

Writing phrases as algebraic equations

Three times Jack’s age equals 12.

- Word Clue:TIMES
- Variable Clue:JACK’S AGE UNDEFINED
- Equation Clue:EQUALS

Writing phrases as algebraic equations

Three times Jack’s age equals 12.

Write it as you read it!!

3j = 12

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!!

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!!

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.

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