1. Study the two number lines below.
    1. How are they alike?
    2. How are they different?
  2. Study the two number lines below. Both show the problem 53 + 99.
    1. Where do the two base-ten hoppers start?
    2. Where do the two base-ten hoppers land?
    3. How many hops did the first hopper use? How many hops did the second hopper use?
    4. Write number sentences to show how each hopper moved.
    5. Which way do you think is easier to understand? Why?
    6. Which way do you think is easier to do? Why?