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Product Of Zero
Problem
Take any 2-digit number and multiply the digits together. If this process is continued, all 2-digit numbers will become a single digit number.
| For example, | 75: | 7  5 = 35, 3 5 = 15, 1 5 = 5 |
| 68: | 6 8 = 48, 4 8 = 32, 3 2 = 6 | |
| 45: | 4 5 = 20, 2 0 = 0 |
How many 2-digit numbers will finish on zero?
Problem ID: 37 (Mar 2001) Difficulty: 1 Star
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