Rev. Notes > IGCSE > Length and time Previous Topic Length and time Next Topic Topics
 Physical quantities Conversion of units Length Length-Measurement Micrometer Micrometer - Pitch Micrometer - Least count Micrometer - Zero error Micrometer - Data Table Time Multiples / submultiples of time Stop-clock Standard form Parallalax error Simple pendulum Amplitude of simple pendulum Time period of simple pendulum Frequency of simple pendulum

Standard form

Standard form is a way of writing down very large or very small numbers easily.

10³ = 1000, so 5 × 10³ = 5000

So 5000 can be written as 5 × 10³

This idea can be used to write even larger numbers down easily in standard form.

Small numbers can also be written in standard form. However, instead of the index being positive (in the above example, the index was 3), it will be negative.

The rules when writing a number in standard form is that first you write down a number between 1 and 10, then you write × 10 (to the power of a number).

 12 000 m 1.2000 X 104 m (to 5 sig. fig.) m 0.002 mm 2 X 10-3 mm= 2 X 10-6 m (to 1 sig. fig.) 0.000 002 m 2 X 10-6 m (to 1 sig. fig.)

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 Sarika Said : out put is given in the book which u have copied.so it was not useful. 06/05/17 06:20 AM

 yo mama Said : well it is informative but out of date but otherwise helpful 30/03/16 09:56 PM

 Edward Said : Very good helped me so much!!! 14/03/15 02:30 PM

 Cara Delivingne Said : This website is very helpful. However, there are still a few changes you can make to it, now that the syllabus has completely been modified. Thank you for your notes though! Xx 11/12/14 08:34 PM

 zuhi Said : where are the SI units,symbols,Prefixes,and diagrams ? 27/09/14 09:05 AM

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 shaheer salim Said : there s a mistake its 1cm(square) = 100 mm(square) 01/03/12 01:04 AM