Lesson 7 of 19
The same move, counted again
Show on a big screenA quiz team starts at 0 points. It loses 3 points in each of 4 rounds. What is the score?
Step 1 of 5
- Start at 0.
- First move: 3 left.
- Second move: 3 left.
- Third move: 3 left.
- Fourth move: 3 left. Land on −12.
The score is −12.
Rule: multiplying by a whole number repeats one move that many times. Product — the answer to a multiply.
(−3) × 4 = −12. Four moves, each 3 left, make one long walk. It is 4 × 3 = 12 steps left.
| Written | Steps | Product |
|---|---|---|
| (−3) × 1 | 3 left | −3 |
| (−3) × 2 | 6 left | −6 |
| (−3) × 3 | 9 left | −9 |
| (−3) × 4 | 12 left | −12 |
| 3 × 4 | 12 right | 12 |
Tap Add one move in the lab. Repeat it until the count is right.
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Try the lab to finish this lesson.