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Puzzle
- US Version
One day, a little boy who was very curious about numbers thought to himself: "If I were to write out all the numbers from 1 to 120, how many times would I write the numeral 1?"
Can you work out the answer?
- UK Version
One day, a little boy who was very curious about numbers thought to himself: "If I were to write out all the numbers from 1 to 120, how many times would the number 1 appear?"
Can you work out the answer?
Hints
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Solution
Incorrect
- US Version
Too bad!
Are there any 1s that you missed?
- UK Version
Too bad.
Did you maybe forget to count some 1s?
Correct
- US Version
Precisely!
The numeral 1 comes up 53 times.
You have to remember to count it twice in 11 and three times in 111. If you keep this in mind, the problem is simple.
- UK Version
One-derful!
The number 1 comes up 53 times.
You have to remember to count it twice in 11 and three times in 111. Keep this in mind and the problem is simple.
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