Because they often work with very large or very small measurements.
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540000000000 in scientific notation is 5.4 x 10^11.
The number 24901.55 in scientific notation is written as 2.490155 × 10^4.
Scientific notation takes up much less space ! consider the number 1,000,000,000,000,000,000 - it's much easier to write it as 1018 and it takes up less space on the page !
149600000 km can be written in scientific notation as 1.496 x 10^8 km.
7.5 x 10^-3