Well, adding x10 is scientific notation.
Example:456-4.56x102. this is because there are two numbers before the decimal.
another example:14945-1.4945x104.
if you do not get it, I'm sorry. This is the best i can explain
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scientific calculators have scientific calculations such as scientific notation, but mechanical ones dont.
Standard Form, Scientific Notation and Exponential Notation are different expressions for the same thing. When a number is expressed as a value between 1 and 10 multiplied by a power of 10 it is said to be in Standard Form (or Scientific Notation or Exponential Notation). 3.4 x 10^14 : 8.9 x 10^-4 : 1.2 x 10² are all written in standard form. 15.28 x 10³ is NOT in standard form as 15.28 is not a number between 1 and 10. When converted to 1.528 x 10^4 then it is in standard form.
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they express the numbers using scientific notation
The way you wrote it is the standard notation. Standard notation means to write the number in its standard form. So, a number such as 150 is simply written as 150 in standard notation. The same applies to decimals.