Lesson 2 of 16
Two spinners, one grid
Show on a big screenSpinner A has 4 equal parts: 1, 2, 3, 4. Spinner B has 3 equal parts: 1, 2, 3. Spin both together. You win if the numbers match. A grid is a table of boxes. Each box is a cell.
Step 1 of 4
- Spinner A across the top. Spinner B down the side.
- Each A number pairs with each B number. 4 × 3 = 12 cells.
- The numbers match in 3 cells: (1, 1), (2, 2), (3, 3).
- Chance of a match = 3/12 = 1/4.
Write A first, then B
One result is a pair, like (2, 3). It means A shows 2 and B shows 3. (3, 2) means A shows 3 and B shows 2.
- Ordered pair — two numbers written in a fixed order.
- (2, 3) and (3, 2) are different results. Order matters.
- Each cell is one outcome. All 12 cells are equally likely.
- Both spinners have equal parts. So every pair has the same chance.
"A is bigger" means A's number is bigger than B's.
| Question | Cells | Chance |
|---|---|---|
| numbers match | (1, 1), (2, 2), (3, 3) | 3/12 = 1/4 |
| A is bigger | (2, 1), (3, 1), (3, 2), (4, 1), (4, 2), (4, 3) | 6/12 = 1/2 |
| sum is 5 | (2, 3), (3, 2), (4, 1) | 3/12 = 1/4 |
Now try it. Tap every cell that fits the question. Then read the chance.
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Try the lab to finish this lesson.