Write Expressions from Phrases

Writing Expressions

Writing Expressions

• Verbal statements can be translated to algebraic expressions.

• It is like deciphering a secret message or translating from one language to another.

Open Ended

What are some words that might tell you that you need to ADD?

Open Ended

What are some words that might tell you that you need to SUBTRACT?

Open Ended

What are some words that might tell you that you need to MULTIPLY?

Open Ended

What are some words that might tell you that you need to DIVIDE?

Expression

• An expression is a mathematical phrase that contains numbers, variables, and operations.

• It does NOT contain an equal sign.

Write expressions

• on the following slides you will write expressions from verbal statements.

• Use the words you brainstormed earlier to help.

• ex: six more than r would be written r+6

• ex: the difference of p and 8 would be written p-8

Multiplication

• is written side by side with the number in front of the variable.

• ex. the product of nine and n would be 9n

• a number with a variable RIGHT next to it means you are multiplying.

division

• with division, you must determine which term is the divisor and which is the dividend

• ex: k divided by ten would be      

   $k\div10$  

Equation

• an equation shows that one expression is equal to another expression

• it DOES contain an equal sign

• words for equals include is and equals

Multiple Choice

(m) bicycles added to 18 bicycles

• m/18
• m + 18
• m - 18
• 18m

Multiple Choice

Write an expression to match the words:

the sum of three and eleven

• 3 x 11

• 11 ÷ 3

• 3 + 11

• 11 - 3

Multiple Choice

2z

• twice as far

• 2 less than

• 2 more than

• divide into 2 groups

Multiple Choice

Product of 4 and p

• 4/p

• 4p

• 4-p

• 4+p

Multiple Choice

11 times a number (z)

• z/11
• 11/z
• 11 - z
• 11z

Multiple Choice

Write an expression to match the words:

the sum of three and eleven

• 3 x 11

• 11 ÷ 3

• 3 + 11

• 11 - 3

Multiple Choice

What is the quotient of y and 5?

• y - 5
• y + 5
• y X 5
• y/5

Multiple Choice

z + 1

• one more than
• half the distance
• 1 inch shorter
• two inches behind

Multiple Choice

z - 4

• 4 inches ahead
• 4 less than z
• 4 times as many
• one-fourth the size

Multiple Choice

2z

• twice as far

• 2 less than

• 2 more than

• divide into 2 groups

Multiple Choice

A number times two is eight.

• 3x = 8

• 3 + x = 8

• 2x = 8

• 2 + x = 8

Multiple Choice

Five less than a number n is thirty four.

• 5 - n = 36

• n - 5 = 35

• 5 - n = 34

• n - 5 = 34

Multiple Choice

The sum of x and ten is twenty.

• x - 10 = 20

• x + 10 = 20

• x + 10 = 25

• 10x = 20