21st Birthday Card In Numbers

£5.00

Twenty one or 21 – a triangular number, expressed here on this different personalised birthday card for a 21st Birthday.

Numbers, eh? Well, for your twenty-one-today year-old they might like to know that 21 is a triangular number (not that they’ll care much) but at least you can impress them with a card that’s a little different from the norm and will allow you to remind them that although they are now an adult, you’re still smarter than them.

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