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A number is written in scientific notation if it is written in the form a • 10^n, where 1 ≤ | a | < 10 and n is an integer.
Write each number in scientific notation.
A. 0.00421
B. 21, 210
Question A
Moving the decimal point three places to the right, I get
4.21.
Now multiply 4.21 by 10^(-3).
Question B
The number 21,210 = 21, 210.00.
To land between 1 and 10, move the decimal point 4 places to the left.
Doing so, I get 2.1210.
Multiply 2.1210 by 10^4.
Do you agree?
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