Challenge B M1L5

Step 1: Rounding

• Before making any decision. The Mayor wants to make a quick educated guess as to who the winner is. Round each city’s population to help you predict an early winner.

• Sun Valley: 7,432,189 people

• Riverdale: 8,059,432 people

• Mountain View: 7,403,921 people

Lakeshore: 8,091,230 people

Step 2: A close call! It is a close call between Sun Valley and Mountain View. Hint: Use your scratch paper to subtract to find the difference! Which city has the greatest population? By how many more people? (a)   has the greatest population by (b)   more people.

• Sun Valley
• 28,268
• Mountain View
• 10,500

Step 3: Using a place value chart.  

• The mayor has handed you his favorite tool. A place value chart! Use your white board place value chart and write the populations down. Now order the populations by least to greatest.

• Lakeshore

• Riverdale

• Sun Valley

• Mountain View

Step 4: Draw a Number Line 

●  On your paper, draw a number line that starts at 7,400,000 and ends at 8,100,000. Plot each city’s population on the number line. Which two cities are closest together on the number line?

7,400,000_________________________________________________ 8,100,000

 

• Sun Valley and Mountain View

• Riverdale and Lakeshore

• Lake Shore and Sun Valley

Step 5: Reasonableness

Was your estimated winner in Step 1 the actual winner of the mayor’s competition? Why or why not?

Remember to use complete sentences!

Challenge Bonus: If each city’s population grows by exactly 100,000 people next year, which city will then have the second-largest population? Explain your thinking.