### 1-4: TEKS Practice

• 1. Which of the following is a pattern in the table?

• A. As the exponent of 10 increases, the number decreases.

• B. As the exponent of 10 decreases, the number decreases.

• C. The exponents that are less than 0 cause the number to become negative.

• D. The exponents that are greater than 0 cause the number to decrease.

• 2. Which list shows the numbers in order from least to greatest?

• A. 3.18 × 10−3, 3.18 × 105, 3.18 × 106

• B. 3.18 × 106, 3.18 × 105, 3.18 × 10−3

• C. 3.18 × 10−3, 3.18 × 106, 3.18 × 105

• D. 3.18 × 105, 3.18 × 10−3, 3.18 × 106

• 3. Which of the following numbers is written in scientific notation?

• A. 20 × 107

• B. 20

• C. 8.66

• D. 8.66 × 107

• 4. Is the number 4.74 × 142 in scientific notation?

• A. No, it is not in scientific notation. The first factor is not less than 10.

• B. No, it is not in scientific notation. The first factor is not greater than or equal to 1.

• C. No, it is not in scientific notation. The second factor is not a power of 10.

• D. The number is in scientific notation.

• 5. Reasoning Is 23 × 10−6 in scientific notation?

• A. No, it is not in scientific notation. The second factor is not a power of 10.

• B. No, it is not in scientific notation. The number is not written as a product of 2 factors.

• C. No, it is not in scientific notation. The first factor is not less than 10.

• D. The number is in scientific notation.

• 6. Error Analysis Fred's math teacher asks, “Which of the following numbers are written in scientific notation?” Fred says, “4.75 × 108 is written in scientific notation.”

• a. What is the correct answer? Check all that apply.

• A. 8.87 × 108

• B. 4.75 × 108

• C. 17

• D. 4.75

• b. What error did Fred make?

• A. The number 17 is also written in scientific notation.

• B. The number 8.87 × 108 is also written in scientific notation.

• C. The number 4.75 × 108 is not written in scientific notation.

• D. The number 4.75 is also written in scientific notation.

• 7. Astronomy In a science fiction book, the distances from four planets to another planet are given in light years. Which list shows the distances in order from least to greatest?

• A. 6.35 × 106, 6.35 × 10−2, 6.35 × 104, 6.35 × 107

• B. 6.35 × 10−2, 6.35 × 10−7,6.35 × 104, 6.35 × 106

• C. 6.35 × 107, 6.35 × 106,6.35 × 104, 6.35 × 10−2

• D. 6.35 × 10−2, 6.35 × 104,6.35 × 106, 6.35 × 107

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