McGraw Hill Glencoe Algebra 1, 2012
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McGraw Hill Glencoe Algebra 1, 2012 View details
4. Scientific Notation
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Exercise 19 Page 417

Practice makes perfect
a

To write one hundredth and one micron in standard form, let's begin by writing one hundredth as a fraction.

1100
0.01

Let's do the same for one micron.

11000000
0.000001

In standard form one hundredth is 0.01, and one micron is 0.000001.

b

Let's review the steps of going from standard form to scientific notation.

  1. Move the decimal to the right of the first nonzero digit. This results in a real number a.
  2. Note the number of places n and the direction that you moved the decimal point.
  3. If the decimal point is moved left, write the number as a * 10^n. If the decimal point is moved right, write the number as a * 10^(- n).
  4. Remove any unnecessary zeros.
To write one hundredth and one micron in scientific notation, let's reference the standard form written in Part A.

0.01 & 0.000001
Now we can follow the steps. Let's begin with one hundredth.

Step Work Result
1 a=001
2 The decimal point moved 2 places to the right. n= 2
3 Since the decimal moved to the right, we will write it as a * 10^(- n). 001 * 10^(- 2)
4 Remove the unnecessary zeros. 1 * 10^(- 2)

Let's continue with one micron. 0.000001

Step Work Result
1 a=000001
2 The decimal point moved 6 places to the right. n=6
3 Since the decimal moved to the right, we will write it as a * 10^(- n). 00000001 * 10^(- 6)
4 Remove the unnecessary zeros. 1 * 10^(- 6)

So one hundredth written in scientific notation is 1 * 10^(- 2) and one micron is 1 * 10^(- 6).

c

The smallest size particle that the filter will stop is one hundredth of a micron. We can get the standard form by multiplying their standard form equivalent. Then we will do the same for the scientific version.

1 * 10^(- 2) * 1 * 10^(- 6)
1 * 1 * 10^(- 2) * 10^(- 6)
1 * 10^(- 2) * 10^(- 6)
1 * 10^(- 8)

We can also multiply both of the standard forms to obtain the same answer in standard form. The smallest size particle that the filter will stop is 1 * 10^(- 8), or 0.00000001.