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We write every number using just ten digits, 0 through 9.

We write every number using just ten digits, 0 through 9.

Even a huge number is built from these ten little digits. We just mix and match them in different spots.

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The Romans had no symbol for zero. The Romans had no symbol for zero. A 'googol' is a 1 followed by one hundred zeros. A 'googol' is a 1 followed by one hundred zeros. A “googol” is the number 1 followed by 100 zeros. A “googol” is the number 1 followed by 100 zeros. Numbers help us tell how many things there are. Numbers help us tell how many things there are. Zero is the only number that can't be written with Roman numerals. Zero is the only number that can't be written with Roman numerals.