Oh, dude, 10 to the 91st power is like a really big number. It's 1 followed by 91 zeros, so you can imagine it's gonna take a while to write out. But hey, at least you'll impress your friends with your knowledge of exponents, right?
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1091 means a "1" followed by 91 "0's".
This is a huge number!
1000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000.
So large I wrote it on two lines!
10 to the 8th power divided by 10 to the 7th power is 10
10 to the fourth power.
Some prefixes, which you use with any unit, are:Tera (10 to the power 12)Giga (10 to the power 9)Mega (10 to the power 6)Kilo (10 to the power 3)Hekto (10 to the power 2)Deka (10 to the power 1)Deci (10 to the power -1)Centi (10 to the power -2)Milli (10 to the power -3)Micro (10 to the power -6)Nano (10 to the power -9)Pico (10 to the power -12)You can find a more complete list at the Wikipedia, in the article "SI prefixes".
When you divide numbers with the same base raised to different exponents, you subtract the exponents. In this case, 10 to the power of 8 divided by 10 to the power of 6 is equal to 10^(8-6) which simplifies to 10^2. Therefore, the result is 100.
10 to the 5th power