Lesson 5 of 9
Moving, from wherever you are
Show on a big screenA chalk-line game. You stand on a mark. A card says "add" or "take away".
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Step 1 of 4
- Start on −3.
- Add 5. Walk right.
- Stop at 2.
- Add moves right.
The rule
Adding walks you right. Taking away walks you left.
Adding a positive number makes a number greater. Greater numbers are further right. Taking away makes a number less. A number that is less is further left.
This is still true when you cross zero.
Example
Start on −3. Add 5. Walk 5 steps right: −2, −1, 0, 1, 2. You stop at 2.
Start on 2. Take away 6. Walk 6 steps left: 1, 0, −1, −2, −3, −4. You stop at −4.
Try the lab to finish this lesson.