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Q: What is ordinary notation?

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9.21x103 in ordinary decimal notation = 9,210

Ordinary decimal notation

Ordinary notation is where the numbers are laid, or written out. Scientific notation is a short handed version with numbers that indicate the amount of zeroes behind the end of the numbers.

Less digits are needed as for example 1,000,000,000 is 1.0*109 in scientific notation

It is 8.91103, exactly as in the question!

Based on your abbreviation for mathematics, I guess you are American. American usage of Standard Notation is to mean ordinary numbers - ie a number written normally. It is the opposite of expanded notation whereby the number is written as the sum of its digits each multiplied by its place value column. For example 123.4 is standard notation; in expanded notation it would be written as 100 + 20 + 3 + 0.4 In the UK, Standard Notation is used to mean scientific notation (or standard index notation) which is a number with one non-zero digit before a decimal point multiplied by a power of 10. It is a way of writing ordinary numbers, especially very big or little ones. For example 123.4 is an ordinary number which is 1.234 × 10² in standard notation. By multiplying out the standard notation the ordinary number is retrieved: 1.234 × 10² = 1.234 × 100 = 123.4

Refer to the related links below.

The terminology can vary, but the following example shows the usual names: 1,023 is in standard form. One thousand twenty-three is in word form. 1000 + 20 + 3 is in expanded form. I expect that 'ordinary notation' means standard notation.

rules in changing/converting the decimal numerals to scientic notation and vice versa

The answer depends on what the wave length is in ordinary numbers! For example, radio waves can have a wavelength of 1 metre: in scientific notation, that is 1!

For the same reason that numbers in ordinary notation need computing.

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