Math Facts That'll Make You Say "Wait, What?" #4
The Romans had no symbol for zero. This wasn't a minor gap, it made their entire number system nearly unusable for anything complicated. Four, meanwhile, is the only number in English whose name contains exactly as many letters as its value.
Here are some facts to share with your kid. Not because they're educational (though they are), but because they're genuinely cool. The kind of cool that makes you look at numbers differently.
Four is the Loneliest Number (That Ever Was)
The number 4 is the only number in the entire English language that has the same number of letters as its value.
Count them: F-O-U-R = 4 letters.
Now try it with literally any other number. Three? That's 5 letters (T-H-R-E-E). Five? That's 4 letters, but five equals 5, not 4. Six? 3 letters. Seven? 5 letters. Go ahead, test every number from zero to a trillion. Four stands alone.
Mathematicians noticed this and probably did a little victory dance.
Zero Absolutely Destroyed the Romans
Zero is one of the most important numbers in mathematics. The Romans did not have it. That was not a quirk. It was a problem.
The Romans had symbols for everything: I for 1, V for 5, X for 10, L for 50, C for 100, D for 500, M for 1,000.
But zero? Nothing. Nada. They just... left it blank or skipped it entirely.
Imagine trying to do your math homework without the number zero. You couldn't write 10, or 100, or 1,000. You couldn't show that you have zero cookies left after eating them all.
The concept of zero came from India and the Middle East much later, and it basically revolutionized mathematics. Romans were doing math on hard mode for centuries.
The Romans built roads and aqueducts and an empire that lasted centuries and all of it without being able to write the number zero. Imagine what they could have done with it. A single missing concept can change everything. That's true of math. It's probably true of a few other things too.
Math isn't boring. We just teach it like it is.
Previous: Math Facts #3: Different sizes of infinity, and why you can't fold paper more than 8 times
Next: Math Facts #5: Bees solved geometry before humans did, and 11 builds perfect pyramids
