200000000000000
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You turn each scientific notation into decimal numbers and then divide. For example, 8 times 10 to the 12 power : 2 times 10 to the 10 power. 8000000000000 : 20000000000 = 400. (I did this using long division). OMG! I just realized that you could remove all the zeros from 80000000000000 that 20000000000 has, so being 800 : 2 which gives you the answer 400. Two ways. But I still wonder, are there any other ways?
The result of multiplying 20,000,000,000 by 99,999,999,999,999,999,999 is 1,999,999,999,999,999,999,800,000,000,000.
20000000000
-19999000000
Two trillion.