Standard Form Exponential Numbers and Powers of

When an old friend of ours was writing a note asking for a favour, he usually finished the note with the phrase Thanks a 10 . That expression, 10 , spoken as ten to the sixth or ten to the power six , is the scientific way of saying one million , and is known as an exponential number, or a number written in standard form, Le. one expressed in powers of 10. 

An exponential number, or a number written in standard form, must always be written as  

One thousand can be written as 1000 or 1 X lO. So 1 is multiplied by 10 three times, 10 X 10 X 10. To get this, we move the decimal place to the left three times  

Generally we can say that 10 raised to the power n, or 10 , is 1 followed by n noughts. Using numbers in standard form is very convenient when dealing with very large numbers. 

What about converting the number 5 000000 to standard form  

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