Some numbers look the same when you turn them upside down. Think of it like a mirror, if you write 123 on paper and flip it over, it becomes 321, which is different. But if you write 818, flipping it still shows 818! These are called perfectly symmetrical numbers because they have the same shape both ways.
Examples
- 818 still looks like 818 when you turn it upside down
- 69 becomes 96
- 1001 stays the same even flipped
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See also
- What are similar numbers?
- Why Are Some Numbers 'Favoured' by Nature?
- Why Are Some Numbers 'Magic' in Math?
- Why Do Numbers Seem to Pop Up Everywhere?
- Why Do Numbers Feel Special?