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NO. 20

Solution:

8.89 is a number between 1 and 10;

.00008885 = 8.89 X 10-5

the decimal point moves RIGHT 5 places;

the exponent is a NEGATIVE 5.

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NO. 21

Study the following problem on SCIENTIFIC NOTATION, rounded off to 3 significant digits.

45,667 = ___________________

Solution:

Place the decimal point between 4 and 5 so the number has a

value between 1 and 10. Since the decimal point moved 4

places LEFT, the power of 10 is a POSITIVE 104. Remember, a

number in Scientific Notation is a number between 1 and 10

times a power of 10.

Thus:

45,667 = 4.5667 X 104 = 4.57 X 104

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NO. 22

Convert this number to SCIENTIFIC NOTATION, rounded off to 3 significant digits.

4,444.3 = ______________