### Brain Teasers

# Equal Numbers?

Using a simple mathematical procedure, I can say that 1, 19, 1999, 2278, 4563739, and 35461 are all equal. How am I able to do this?

### Hint

It is basic math.### Answer

I simply add all digits of each number together, and keep adding until my answer is a single digit number. For example, 1+9+9+9=28, and 2+8=10, and 1+0=1, so 1999 is equal to 1. An interesting side note is that each time you get a single digit answer of 3, 6, or 9, the starting number is divisible by 3.Hide Hint Show Hint Hide Answer Show Answer

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