810000000000000 + 1500000000000000 = 2310000000000000 = 2.31 x 10^15
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15 + 1000 = 1015
The LCM of 1015 and 18 is 18270. The LCM of 10, 15 and 18 is 90.
120 times 8 plus 15 is equal to 975.
(1) + (000000000000000) = 1If it's actually "1 followed by 15 zeros" that you're looking for, that's "one quadrillion" (in American usage).It's usually written "1 x 1015", and pronounced "one times ten to the fifteenth".
10/15 = 2/3