



 
Astrid, There are instructions for writing a number in Scientific notation in the answer Sara gave to a previous question. Following her instructions the first two nonzero digits in 3,700,000,000 are 3 and 7 so put the decimal between them
To move the decimal from being between the 3 and 7 to the position of the decimal in 3,700,000,000. you need to move it 9 places to the right, in other words you have to multiply by 1,000,000,000 which is 10^{9}. Thus
For your second problem which is to evaluate (2.5 x 10^5) (1.56 x 10^3) write
Can you complete the problem now? Penny  


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