Chapter 1 Section 3 Write Expressions Objective Students

Chapter 1 Section 3 Write Expressions Objective: Students will translate verbal phrases into expressions Standard: A. SSE. 1 & A. SSE. 2

Write Expressions Symbol Addition Meaning Sum, plus, total, more than, increased by Example The sum of 2 and a number x x+2 Difference, less than, minus, decreased by Multiplication The difference of a number n and 6 n-6 Times, products, ¼ of a number x multiplied by, of ¼x Division Quotient, divided by, divided into Subtraction The quotient of a number k and 2

NOTE: • Order is important when writing SUBTRACTION AND DIVISION!!

Translate into an expression 1. The sum of 6 and a number y 6 + y OR y+6 2. Seven less than twice a number z 7 - 2 z <- NOT Correct! “less than” means switch! 2 z - 7

Write an expression for the situation 3. Number of minutes in s seconds We know 60 seconds in one minute so: 4. Number of candies from a 12 pack left to eat if you’ve eaten z candies 12 - z

Rates Rate: fraction that compares two quantities measured in different units Unit Rate: Example: miles per hour, Calories per serving. n 4

Unit rates 5. Find the unit rate: 60 miles per hour Word Problems: 6. Jenny earns $50 a day working part time at a supermarket. Write an algebraic expression to represent the amount of money she will earn in d days. How much money will she have made after 5 days of working? b. In 5 days: a. Think: Would I use +, - , * or ÷ 50 d = 50(5) = 50 * d or 50 d $250

1. 3 HW • pg. 18 3 – 26 all, 31 - 33