math
In the number 30, look at the two parts of it.
In the number 30, the zero doesn't mean 'nothing' — it holds a place, telling us there are no single ones, just 3 whole tens.
It's wrong to say there are 'zero tens,' since there actually are 3 tens, and the number definitely isn't 'empty' — it stands for a real amount, thirty.
Zero is such a clever invention that without it, we couldn't tell the difference between 3, 30, and 300 just by looking at the digits — ancient number systems that lacked a zero struggled with exactly this problem!
math
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