Unit 10 Contents

To find the solution, Professor Peabody needs to make sure he solves the problem in the right order. He knows that first he needs to multiply the 7 2 = 14 to show the total distance the hopper traveled. He then needs to add the 1 + 14 = 15 to show that the hopper started his trip on one.

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Professor Peabody watches a +3 hopper. He writes this number sentence to show its trip.

3. What does each number in his number sentence represent?
1. Levi and Sam each solved Professor Peabody's number sentence. Levi said the constant hopper will land on 18 and Sam said it will land on 14. Do you agree with Levi or Sam?
2. Show or tell how you made your decision.
3. Use your desk number line to show the +3 hopper's trip.

Constant hoppers do not always have to hop to the right on the number line. Professor Peabody found a −1 (“minus one”) hopper. It hops 1 unit to the left on every hop.

1. Professor Peabody watches a −3 hopper start at 10 and hop 2 times. Where did it land?
   

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   Professor Peabody wants to use number sentences to show the −3 hopper's trip. He writes:

2. What do each of the numbers in this number sentence represent?
3. Which operation does Professor Peabody complete first. Why do you think so?
4. Which operation does Professor Peabody complete next? Why do you think so?