Question 1: Arrange the following lengths in increasing order: 3.456 m, 3.45 m, 3.4567 m.

Answer: 3.45 m, 3.456 m, 3.4567 m

Question 2: Calculate the difference between the longest and shortest lengths: 5.678 km and 5.67 km.

Answer: 0.008 km

Question 3: The length of a swimming pool is 25.75 meters, and the length of a running track is 400 meters. Which is longer? Show your reasoning.

Answer: The running track is longer because 400 m > 25.75 m.

Question 4: Order these animal lengths from shortest to longest: Elephant (3.2 m), Giraffe (5.5 m), Lion (2.5 m).

Answer: Lion, Elephant, Giraffe

Question 5: Estimate the length of a standard classroom whiteboard in centimeters, given that it is approximately 2.5 meters. Convert to centimeters.

Answer: 250 centimeters

Question 6: Plot the following lengths on the grid: 1.2 m, 0.95 m, 1.5 m. Arrange them from shortest to longest.

Answer: 0.95 m, 1.2 m, 1.5 m

Question 7: A pipe is 4.75 meters long, and another is 4.8 meters long. Which is longer? Explain how you determined this.

Answer: The second pipe is longer because 4.8 > 4.75.

Question 8: Identify the mistake: Comparing 0.75 km and 0.750 km, a student claims 0.75 km is shorter. Is this correct? Why or why not?

Answer: Incorrect; 0.75 km and 0.750 km are equal because trailing zeros do not change the value.

Question 9: Order these decimal lengths from smallest to largest: 0.0095 km, 0.095 km, 0.009 km.

Answer: 0.009 km, 0.0095 km, 0.095 km

Question 10: A measuring tape shows lengths of 2.345 m, 2.34 m, and 2.346 m. Order these lengths from shortest to longest.

Answer: 2.34 m, 2.345 m, 2.346 m

Question 11: Challenge: A racing track measures 1.999 km, and a nearby pathway measures 2 km. Which is longer? If the pathway is longer, by how much?

Answer: The pathway is longer by 0.001 km.

Question 12: Extended challenge: Construct a set of three lengths in meters that are each within 0.01 meters of each other but arranged in increasing order.

Answer: Possible answers: 5.12 m, 5.115 m, 5.125 m.