Activities

1. Write an expression that means the same as 15 more than a number

2. Write an expression that means 8 is being subtracted from a number

3. Write an expression that means multiply the difference of 10 and 7 by 6

4. Nicole owns 5 fewer than twice the pairs of shoes that Betty has.  Let s represent the number of shoes that Betty has.  Write an expression that will find the number of shoes that Nicole has.

5. An online store charges $5 for shipping on all orders.  They are having a sale on all t-shirts, $7 each!  You and your friends are going to order some shirts.  Write an expression that you could use to find the cost of the order.

6. A new streaming service is opening up.  They are offering new customers a great plan if they switch to them.  The monthly fee is going to be $15 plus $2.50 for each connected device.

a. If you connect t devices write an expression to find the monthly cost of your bill.
b. If you know that your family will connect 8 devices, how much would your monthly bill be?

7. The teacher wrote the expression below on the board and asked students to write a statement to describe it.      (12 + 6) ÷ 3

Maddie wrote: 12 plus 6 divided by 3

Alex wrote:  The sum of 12 and 6 divided by 3

Steve wrote: The product of 12 and 6 divided by 3

       One student is correct, who is and why?

Answer Key/Rubric

1. 15 + n or n + 15
   
   
2. n – 8
   
   
3. or 
   
   
4. 2s – 5
   
   
5. 7x + 5 or 5 + 7x
   
   
6. Answers as follows
   
   a. 15 + 2.50t or 2.50t + 15
   b. 8 devices would cost $35 per month.
   
   
7. Alex is correct.

        Reasons may include, but are not limited to:

• Alex used the words “the sum of” which means the addition problem had to be calculated prior to doing the division, which is what the () means
• Maddie has the correct operations, but her expression would be 12 + 6 ÷ 3, and then division would be first not the addition
• Steve used the word product which means to multiply, not add