Texas Go Math Grade 8 Module 2 Quiz Answer Key

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Texas Go Math Grade 8 Module 2 Quiz Answer Key

Texas Go Math Grade 8 Module 2 Ready to Go On? Answer Key

2.1 Scientific Notation with Positive Powers of 10

Write each number in scientific notation.

Question 1.
2,000 ______________
Answer:
2,000 Given
2.0 Move the decimal point 3 places to the left. Remove the extra zeros.
1000 Divide the original number by the result from above.
103 Write the answer as power of 10.
2.0 × 103 Write the product of the results from the above.
2.0 × 103

Question 2.
91,007,500 ____________
Answer:
91,007,500 Given
91,007,500 Move the decimal point 7 places to the left. Remove the extra zeros.
10000000 Divide the original number by the result from above.
107 Write the answer as power of 10.
9.10075 × 107 Write the product of the results from the above.
9.10075 × 107

Question 3.
On average, the Moon’s distance from Earth is about 384,400 km. What is this distance in scientific notation? __________________
Answer:

Write each number in standard notation.

Question 4.
1.0395 × 109 _______________
Answer:

Question 5.
4 × 102 _______________
Answer:

Question 6.
The population of Indonesia was about 2.48216 × 108 people in 2011. What is this number in standard notation? _______________
Answer:

2.2 Scientific Notation with Negative Powers of 10

Write each number in scientific notation.

Question 7.
0.02 _______________
Answer:

Question 8.
0.000701 ____
Answer:
0.000701 Given
7.01 Place the decimal point
4 Count the number of places the decimal point is moved
7.01 × 104 Multiply 7.01 times a power of 10. Since 0.000701 is less than 1, the decimal point moves to the right and the exponent on 10 is negative.

Write each number in standard notation.

Question 9.
8.9 × 10-5 ______________
Answer:
8.9 × 10-5 Given
5 Use the exponent of the power of 10 to see how many places to move the decimal point.
places

0.000089 Place the decimal point Since you are going to write a number less than 8.9, move the decimal to the left. Add placeholder zeros if necessary.
0.000089

Question 10.
4.41 × 10-2 ______________
Answer:
4.41 × 10-2 Given
2 Use the exponent of the power of 10 to see how many places to move the decimal point.
places

0.0441 Place the decimal point Since you are going to write a number less than 4.41, move the decimal to the left. Add placeholder zeros if necessary.
0.0441

Complete the table.

Question 11.
Texas Go Math Grade 8 Module 2 Answer Key 1
Answer:

Question 12.
Texas Go Math Grade 8 Module 2 Answer Key 2
Answer:

Question 13.
Texas Go Math Grade 8 Module 2 Answer Key 3
Answer:

Essential Question

Question 14.
How is scientific notation used in the real world?
Answer:

Texas Go Math Grade 8 Module 2 Mixed Review Texas Test Prep Answer Key

Selected Response

Question 1.
Which of the following is the number 90 written in scientific notation?
(A) 90 × 102
(B) 9 × 102
(C) 90 × 101
(D) 9 × 101
Answer:

Question 2.
About 786,700,000 passengers traveled by plane in the United States in 2010. What is this number written in scientific notation?
(A) 7,867 × 105 passengers
(B) 7.867 × 102 passengers
(C) 7.867 × 108 passengers
(D) 7.867 × 109 passengers
Answer:
(C) 7.867 × 108 passengers

Explanation:
786,700,000 Given

7.867 Move the decimal point 8 places to the left. Remove the extra zeros.

100000000 Divide the original number by the result from Step 1.
108 Write the answer as power of 10.
7.867 × 108 Write the product of the results from above
There are 7.867 × 108 passengers

Question 3.
In 2011, the population of Mali was about 1.584 × 107 people. What is this number written in standard notation?
(A) 1.584 people
(B) 1,584 people
(C) 15,840,000 people
(D) 158,400,000 people
Answer:
(C) 15,840,000 people

Explanation:
1.584 × 107 Given
7 Use the exponent of the power of 10 to determine the number places to move the decimal point places

15,840,000 Place the decimal point. Since you are going to write a number greater than 1.584, move the decimal to the right. Add placeholder zeros if necessary.
There are
15,840,000 people

Question 4.
The square root of a number is between 7 and 8. Which could be the number?
(A) 72
(B) 83
(C) 51
(D) 66
Answer:
(C) 51

Explanation:
7 and 8 Given

49 and Find the squares of the number
64
Since the square root lies between
$7$ and $8$, the square of the number
lies between $49$ and $64$, hence it
could be $51$

Question 5.
Pilar is writing a number in scientific notation. The number is greater than ten million and less than one hundred million. Which exponent will Pilar use?
(A) 10
(B) 7
(C) 6
(D) 2
Answer:

Question 6.
Place the numbers in order from least to greatest.
0.24, 4 × 10-2, 0.042, 2 × 10-4, 0.004
(A) 2 × 10-4, 4 × 10-2, 0.004, 0.042, 0.24
(B) 0.004, 2 × 10-4, 0.042, 4 × 10-2, 0.24
(C) 0.004, 2 × 10-4, 4 × 10-2, 0.042, 0.24
(D) 2 × 10-4, 0.004, 4 × 10-2, 0.042, 0.24
Answer:
(D) 2 × 10-4, 0.004, 4 × 10-2, 0.042, 0.24

Explanation:
0.24, 4 × 10-2, 0.042, 2 × 10-4, 0.004
2.4 × 10-1 Express the numbers in scientific notation
4 × 10-2
4.2 × 10-2
2 × 10-4
4 × 10-3

2 × 10-4 Compare the power of 10 and if they are same
4 × 10-3 compare the first factor
4 × 10-2 Placed in the order from least to greatest
4.2 × 10-2
2.4 × 10-1
2 × 10-4, 0.004, 4 × 10-2, 0.042, 0.24 placed in the order from least to greatest

Question 7.
Which of the following is the number 1.0085 × 10-4 written in standard notation?
(A) 10,085
(B) 1.0085
(C) 0.00010085
(D) 0.000010085
Answer:

Question 8.
A human hair has a width of about 6.5 × 10-5 meter. What is this width written in standard notation?
(A) 0.00000065 meter
(B) 0.0000065 meter
(C) 0.000065 meter
(D) 0.00065 meter
Answer:
(C) 0.000065 meter

Explanation:
6.5 × 10-5 Given
5 Use the exponent of the power of 10 to see how many places to move the decimal point.
places

0.000065 Place the decimal point Since you are going to write a number less than 6.5, move the decimal to the left. Add placeholder zeros if necessary.
The width in standard notation is $0.000065$ meter

Gridded Response

Question 9.
Write 2.38 × 10-1 in standard form.
Texas Go Math Grade 8 Module 2 Answer Key 4
Answer:

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