Use the numbers and units from the list to find as many equivalent measurements as you can. For example, you might write “30 minutes is hour.”

You can use the numbers and units more than once.

Your teacher will give you some cards with a scale on each card.

1. Take turns with your partner to sort the cards into sets of equivalent scales. Each set should have at least two cards.

   1. For each match that you find, explain to your partner how you know it’s a match.

   2. For each match that your partner finds, listen carefully to their explanation. If you disagree, discuss your thinking and work to reach an agreement.

2. Trade places with another group and check each other’s work. If you disagree about how the scales should be sorted, work to reach an agreement.

   Pause here so your teacher can review your work.

3. Next, record one of the sets with three equivalent scales and explain why they are equivalent.

As of 2016, Tunisia holds the world record for the largest version of a national flag. It was almost as long as four soccer fields. The flag has a circle in the center, a crescent moon inside the circle, and a star inside the crescent moon. 

1. Complete the table. Explain or show your reasoning.

   	flag length	flag height	height of crescent moon
   actual	396 m		99 m
   at 1 to 2,000 scale		13.2 cm

2. Complete each scale with the value that makes it equivalent to the scale of 1 to 2,000. Explain or show your reasoning.

   1. 1 cm to ____________ cm
   2. 1 cm to ____________ m
   3. 1 cm to ____________ km
   4. 2 m to _____________ m
   5. 5 cm to ___________ m
   6. ____________ cm to 1,000 m
   7. ____________ mm to 20 m
3. 1. What is the area of the large flag?
   2. What is the area of the smaller flag?
   3. The area of the large flag is how many times the area of the smaller flag?

Your teacher will give you a floor plan of a recreation center.

1. What is the scale of the floor plan if the actual side length of the square pool is 15 m? Express your answer both as a scale with units and without units.
2. Find the actual area of the large rectangular pool. Show your reasoning.
3. The kidney-shaped pool has an area of 3.2 cm² on the drawing. What is its actual area? Explain or show your reasoning.