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Algebraic Expressions

Day 1: Translating Verbal to Algebraic

Slide 2

Today's Objectives

Slide 3

Warm-Up: Numerical Expressions

Write a numerical expression for each phrase:

  1. The sum of 8 and 5.
  2. The product of 10 and 3.
  3. 12 less than 20.
Slide 4

Keywords are Clues!

ADDITION (+)

sum, plus, more than, increased by

SUBTRACTION (-)

difference, minus, less than, decreased by

MULTIPLICATION (×)

product, times, of, twice

DIVISION (÷)

quotient, divided by, ratio of

Slide 5

Watch Out! Turn-Around Words

Phrases with "than" reverse the order.

"10 less than a number n"

n - 10

"8 more than a number y"

y + 8

Slide 6

Let's Practice Together

  1. A number decreased by 12
  2. The sum of twice a number and 7
  3. 5 less than the product of 3 and a number
Slide 7

Independent Practice

Choose your level and write the expression for each phrase.

RED (Developing)

  1. The sum of a number and 9.
  2. The product of 6 and a number.
  3. A number minus 4.

YELLOW (Applying)

  1. 15 less than a number.
  2. Twice a number increased by 1.
  3. The quotient of a number and 8.

GREEN (Securing)

  1. You buy x sodas for $2 each and a bag of chips for $4. Write an expression for the total cost.
  2. The product of 4 and the sum of a number and 6.
Slide 8

Exit Ticket

Write an algebraic expression for each phrase:

  1. 7 more than a number x.
  2. The product of 10 and a number y.
  3. 2 less than twice a number k.