The Problem

Use a calculator to approximate each expression. Write each answer in scientific notation.

a).

b).

c).

 

Expressions such as these must be entered correctly into the calculator in order to obtain correct answers. Pay special attention to parentheses.


a). To enter the expression press

key press sequence

TI83 graphics screen

The answer given is 1736. To change to scientific notation, move the decimal point between the 1 and 7. Since the move is to the left, the exponent will be positive. Thus .

b). To enter the expression 6 times 10 to the 3rd divided by 4 times 10 to the 6th times 1.2 times 10 squared

 

key presses

TI83 graphics screen

The answer given is .18. To change to scientific notation, move the decimal point between the 1 and 8. Since the move is to the right, the exponent will be negative. Thus point 18 equals 1 point 8 times 10 to the -1 power.

c). To enter the expression

key presses

TI83 graphics screen

The answer, 1.58960355E12 is already given in scientific notation meaning . Rounded to 3 significant digits, that would be 1.59 X 1012.

 

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