1. **Problem Statement:** Bill spins two spinners, Spinner A with numbers 8, 4, 2, 1 and Spinner B with numbers 7, 9, 5, 3. We need to complete the addition chart showing the sums of numbers from Spinner B (rows) and Spinner A (columns). 2. **Rule:** The sum is calculated by adding the number from Spinner B to the number from Spinner A. 3. **Given partial chart:** | + | 8 | 4 | 2 | 1 | |---|---|---|---|---| | 7 | 15| 11| 9 | 8 | | 9 | ? | 13| 11| ? | | 5 | 13| ? | ? | 6 | | 3 | 11| ? | 5 | ? | 4. **Calculate missing sums:** - For row 9: - 9 + 8 = 17 - 9 + 1 = 10 - For row 5: - 5 + 4 = 9 - 5 + 2 = 7 - For row 3: - 3 + 4 = 7 - 3 + 1 = 4 5. **Complete chart:** | + | 8 | 4 | 2 | 1 | |---|---|---|---|---| | 7 | 15| 11| 9 | 8 | | 9 | 17| 13| 11| 10| | 5 | 13| 9 | 7 | 6 | | 3 | 11| 7 | 5 | 4 | 6. **Summary:** All missing values are filled by adding the corresponding Spinner A and Spinner B numbers. Final completed chart: $$\begin{array}{c|cccc} + & 8 & 4 & 2 & 1 \\ \hline 7 & 15 & 11 & 9 & 8 \\ 9 & 17 & 13 & 11 & 10 \\ 5 & 13 & 9 & 7 & 6 \\ 3 & 11 & 7 & 5 & 4 \end{array}$$