Wednesday, 23 November 2016

STANDARD FORM 4


Evaluate the following giving your answer in standard form.

982.7 x 10-9
   5 x 10-20

Solution

982.7 x 10-9
       5 x 10-20

982.7  x   10-9
       5         10-20

=  196.5 x 10-9 –(-20)

=  196.5 x 10-9 + 20    

=  196.5 x 1011      then we change 116.54 into standard form as well

= 1.965 x 102 x 1011   [when we have exponents with same base, we add 
   the powers.]
 
= 1.965 x 1013

= 1.97 x 1013 [correct to 2 d.p.]

Hence   982.7 x 10-9   = 1.97 x 1013
                5 x 10-20


TRY THIS………………..

Evaluate the following giving your answer in standard form.
0.01547 x 10-5
   4 x 10-30


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