unit 3 sec 2.5

Unit 3 sec 2.5 scientific notation.

06 November 2015

23:46

  Some of the numbers used in mathematics, science, medicine, and economics are very big and very small.

Nos like these and more usefully expressed in scientific notations (which is also called standard form).

Strategy to express a number of scientific notation

1.    Place the decimal point between the cheese of one and second significant digits together a number between 1 and 10.

2.    Count to find the power of the 10 by which this number should be multiplied (or divided) to restore it to the original number.

  The reason is simple that this notation has been agreed as the one that everyone will use. Using consistent notation makes it easier to compare numbers carry out calculations.

   To convert a number from scientific notation back to ordinary notation, you just need to carry out the multiplication or division. Since the multiplication or division is a power of 10. This involves moving the decimal point.

Calculations using numbers in scientific notation

you will use your calculator to carry out most calculations involving numbers in scientific notation, and you will be asked to practice this in an activity at the end of this subsection. There may be occasions perhaps when you are making a quick estimate, when it is more convenient to work out the answers by hand, using the index was that you met earlier.