Age Relationships and Linear Functions

In this lesson, Mr. Hul explores the concept of using substitution to evaluate addition and subtraction expressions. The lesson begins with an exercise on age patterns, followed by examples involving age calculations using variables, box tops collection over days, and paper recycling over weeks. The lesson concludes with an age table exercise for Kristen and Shelly, emphasizing the importance of recognizing patterns in math.

If the narrator is 10 years old, how old is their sister?

• 8 years old

• 10 years old

• 12 years old

• 14 years old

What expression represents the sister's age if the narrator's age is represented by y?

• y - 2

• y + 2

• 2y

• y / 2

If Noah starts with 10 box tops and collects 1 per day, how many will he have after 5 days?

• 25

• 20

• 10

• 15

Carter starts with 15 box tops and collects 1 per day. How many will he have after 10 days?

• 30

• 20

• 15

• 25

How much paper does the Primary School recycle after 5 weeks if they recycle 200 pounds per week?

• 1000 pounds

• 500 pounds

• 800 pounds

• 1200 pounds

The Intermediate School starts with 300 pounds and recycles 200 pounds weekly. How much paper will they have recycled after 10 weeks?

• 3000 pounds

• 2300 pounds

• 2000 pounds

• 2500 pounds

If Kristen is 10 years old, how old is Shelly?

• 10 years old

• 12 years old

• 15 years old

• 20 years old

What is the expression for Kristen's age if Shelly's age is represented by s?

• s / 5

• s * 5

• s - 5

• s + 5

If Shelly is 25 years old, how old is Kristen?

• 30 years old

• 25 years old

• 22 years old

• 20 years old

What pattern is used to determine Shelly's age based on Kristen's age?

• Add 5 to Kristen's age

• Subtract 5 from Kristen's age

• Multiply Kristen's age by 5

• Divide Kristen's age by 5