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Teacher Tips and Answers

Page 293

Solving Problems

Imagine the problem-solving process that led to the invention of escalators.

1. Name the problem.
    Lots of people need to change floors quickly.

2. List everything you know about the problem.
    Stairs are hard for some people.
    Elevators are too slow.
    Upstairs stores are losing customers.

3. Think of ways to solve the problem.
    We could put in trampolines.
    We could use pulleys and slides.
    We could make stairs that work like elevators—moving staircases that go up and down.

4. Choose the best plan and try it out.
    Let’s invent an escalator!

5. Ask yourself: How did the plan work?
    Escalators safely carry people up and down.
    People don’t wait for an escalator—just get on.
    Escalators are silent, fast, and a little fun, too!

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