The page Seven by Eleven Trick ends with these questions:
Why can you get the sum by multiplying the 7th number by 11? If the 1st number in the list had a value of a and the 2nd number in the list had a value of b, what would be the value of the 7th number in terms of a and b and what would be the total?
Here's a hint:
| 1. | a |
| 2. | b |
| 3. | a + b |
| 4. | a + 2b (b + b = 2 x b = 2b) |
| 5. | 2a + 3b |
| 6. | 3a + 5b |
| 7. | 5a + 8b |
| 8. | 8a + 13b |
| 9. | |
| 10. | |
| 11. |
When you're ready to go back to the exercise page, click here.
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