Answer:
<u>Undecillion</u> has 36 0's

It's because a tenth means that you've divided it by 10. So if it's 20, it means you're multiplying tenths by 20, leaving you with 2 wholes.
For example, you have 2 cakes and you cut each into 10 slices, the slices are each one tenth of the whole cake, and in total there are 20 tenths.
Its -4/3
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7^4 the ^ is the exponent symbol if you did not know
7^4=2,401