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Practice Buddy
Understand Place Value
Do Research Use the Internet or other sources to find out more about pollinating insects in the United States. What types of insects are they? How many are there of each type? How many crops and flowering plants depend on pollinating insects in order to produce the foods we eat?
Journal: Write a Report Include what you found. Also in your report:
• Choose two of the pollinating insects. Estimate how many crop plants each type of insect pollinates.
• Estimate how many of your favorite foods and beverages come from pollinated plants.
• Make up and solve ways to compare and order your data.
Then we better get busy as bees! Here’s a project on the value of pollinating insects and their place in our world. Oops,
I meant place value.
Did you know pollinating insects produce 13 of all the food and beverages
we consume?
For every human on the planet there are more than 200 million
insects!
Math and Science Project: Pollinating Insects
TOPIC
1 Essential Question: How are whole numbers and decimals written, compared, and ordered?
Topic 1 1
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A store sells AA batteries. There are 10 batteries in a package. How many batteries are in 10 packages? 100 packages? Solve these problems any way you choose.
Lesson 1-1Patterns with Exponents and Powers of 10
sheets of paper. What is the total number of sheets in both boxes?
19. Number Sense A company had 9 × 106 dollars in sales last year. Explain how to find the product 9 × 106.
21. MP.4 Model with Math Isaac takes 5 minutes to ride his bike down the hill to school and 10 minutes to ride up the hill from school. He attends school Monday through Friday. How many minutes does he spend biking to and from school in two weeks? Write an equation to model your work.
23. Choose all the equations that are true.
10 × 10 × 10 × 10 = 40
10 × 10 × 10 × 10 = 104
10 × 10 × 10 × 10 = 1,000
10 × 10 × 10 × 10 = 10,000
10 × 10 × 10 × 10 = 4 × 104
24. Choose all the equations that are true.
6 × 105 = 6 × 100,000
6 × 105 = 6 × 10,000
6 × 105 = 600,000
6 × 105 = 60,000
6 × 105 = 650,000
18. MP.1 Make Sense and Persevere A post is put every 6 feet along a fence around a rectangular field that is 42 ft long and 36 ft wide. How many posts are needed?
20. An aquarium has the same shape as the solid figure shown below. What is the name of this solid figure?
22. Higher Order Thinking Santiago hopes to buy a 4-horse trailer for about $12,000. Describe all the numbers that when rounded to the nearest hundred are 12,000.
16. Maria saw 2 × 101 dogs in the park on Saturday. She saw twice as many dogs on Sunday as she saw on Saturday. How many dogs did she see over the two days?
17. Number Sense In which place is the digit in the number 5,341 that would be changed to form 5,841? How do the values of the two numbers compare?
18. Math and Science There are 2,000 pounds in a ton. How can you write 2,000 with an exponent?
20. MP.4 Model with Math James practiced piano for 48 minutes. Alisa practiced for 5 times as long as James. How many minutes did Alisa practice? How many minutes in all did James and Alisa practice? Write an equation to model your work.
19. MP.6 Be Precise Kay buys 12 pounds of apples. Each pound costs $3. If she gives the cashier two $20 bills, how much change should she receive?
21. Higher Order Thinking George said that 6 × 103 is 180. Do you agree or disagree? If you disagree, explain the mistake that he made and find the correct answer.
Common Core Assessment22. Choose all the equations that are true.
Look Back! MP.3 Construct Arguments Is the relationship between the value of the two 8s in 1,088,000 the same as the relationship between the value of the two 8s in the problem above? Explain.
Use Structure You can use what you know
about place-value relationships to compare the values.
Show your work!
Content Standard 5.NBT.A.1 Mathematical Practices MP.2, MP.3, MP.4, MP.7
understand place-value relationships.
The population of a city is 1,880,000. What is the value of the two 8s in this number? How are the two values related? Use the place-value chart to help solve the problem.
Convince Me! MP.2 Reasoning Is the value of the 1 in 1,440,000 10 times as great as the value of the 4 in the hundred thousands place? Explain.
Look at the expanded form of 1,440,000. The value of the 4 in the hundred thousands place is 400,000. The value of the 4 in the ten thousands place is 40,000.
400,000 is 10 times as great as 40,000. 40,000 is 1
Using exponents, this can be written as: (1 × 106) + (4 × 105) + (4 × 104)
Number name: one million, four hundred and forty thousand
Writing the number in expanded form
can help.
According to the 2010 U.S. Census, the population of Phoenix, Arizona is about 1,440,000. What is the relationship between the value of the two 4s in this number?
How Are Place-Value Positions Related?
Sometimes word form is used instead of number name.
1. MP.3 Construct Arguments In 9,290, is the value of the first 9 ten times as great as the value of the second 9? Explain.
2. Write 4,050 in expanded form.
3. the 7s in 7,700 4. the 2s in 522
In 5–7, write each number in standard form.
In 8–10, write each number in expanded form.
When two digits next to each other in a number are the same, the digit on the left has 10 times the value of the digit to its right.When two digits next to each other are the same, the digit on the right has 1
14. Write the number name and expanded form for the number of driver ants that could be in two colonies.
16. MP.3 Critique Reasoning Paul says that in the number 6,367, one 6 is 10 times as great as the other 6. Is he correct? Explain why or why not.
18. Higher Order Thinking Dan wrote (2 × 106) + (3 × 104) + (5 × 103) + 4 for the expanded form of two million, three hundred fifty thousand, four. What error did he make in the expanded form? What is the standard form of the number?
15. Math and Science A queen ant can produce about nine million ants in her lifetime. Write this number in standard form.
19. Colleen says she is thinking of a 4-digit number in which all the digits are the same. The value of the digit in the hundreds place is 200.
Part A
What is the number? Explain.
Part B
Describe the relationship between the values of the digits in the number.
17. Jorge drew a square that had a side length of 8 inches. What is the perimeter of Jorge’s square?
Up to 22,000,000 driver ants can live in a single colony.
9. MP.7 Use Structure Sue and Jonah chose numbers for a place-value game. Sue chose the number one hundred fifty-two thousand. Jonah chose five million for his number. Who chose the greater number? Explain.
10. Higher Order Thinking One day, the state fair total attendance was 126,945. Round 126,945 to the nearest hundred thousand, nearest ten thousand, and nearest thousand. Which of these rounded amounts is closest to the actual attendance?
11. MP.4 Model with Math Maricko and her family went on a 10-day vacation. She read 12 pages in her book each day. How many total pages did she read while on vacation?
12. MP.3 Construct Arguments Is the value of the first 5 in California’s population 10 times as great as the value of the second 5? Explain.
13. Number Sense Write the population of Florida in expanded form using exponents.
14. Joseph says that in the number 9,999,999, all the digits have the same value.
Part A
Is Joseph correct? Explain.
Part B
Describe the relationship between the values of the digits in the number.
16 Topic 1 Lesson 1-2
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Jennie is training for a race. On Tuesday she finished her sprint 0.305 second faster than she did on Monday. How can you explain the meaning of 0.305? Solve this problem any way you choose.
Convince Me! MP.2 Reasoning How is 0.004 the same as and different from 0.444?
The number name for 41,000 is four
thousandths. A decimal place-value chart can help you determine the decimal. Notice that the thousandths place is three places to the right of the decimal point.
So, 41,000 can be represented by the
decimal 0.004.
How Can You Read and Write Decimals to the Thousandths?
You can write 4 out of 1,000 as the fraction 4
1,000.A box is filled with 1,000 cubes. Amy picks out 4 cubes. How can you represent 4 out of 1,000 cubes as a decimal?
10 × 10 × 10 = 103
How can 4441,000 be represented by a decimal?
4441,000 is read as four hundred forty-four thousandths and represented by the decimal 0.444.
The value of the digit 4 in the hundredths place has 10 times the value of the digit 4 in the thousandths place and 1
1. MP.6 Be Precise If four cubes are pulled from the box on the previous page, how would you write the fraction representing the cubes that are left? the decimal representing the cubes that are left?
3. 0.001 = 4. 0.05 =
2. MP.2 Reasoning 0.3 is 10 times as great as what decimal? 0.003 is 1
10 of what decimal?
In 3–6, write each decimal as a fraction.
In 7–10, write each fraction as a decimal.
In 11–18, write each decimal as a fraction.
In 19–26, write each fraction as a decimal.
11. 0.007 12. 0.08 13. 0.065 14. 0.9
15. 0.832 16. 0.203 17. 0.78 18. 0.999
7. 21,000 = 8. 34
100 =
9. 5081,000 = 10. 99
1,000 =
5. 0.512 = 6. 0.309 =
19. 4341,000 20. 3
10 21. 8731,000 22. 17
1,000
23. 3091,000 24. 5
1,000 25. 6100 26. 999
1,000
*For another example, see Set C on page 49.
27. Look at the middle 9 in Exercise 18. How is its value related to the value of the 9 to its left? to the value of the 9 to its right?
28. MP.4 Model with Math The Palmer’s property tax bill for the year is $3,513. In their first installment, they paid $1,757. How much do they still owe on their bill? Write an equation to model your work.
29. MP.7 Use Structure Write the fractions 22
100 and 221,000 as decimals.
How are the values of the digit 2 related in each of the decimals?
30. Simon scored 4 × 102 points in a game. Joe scored 2 × 103 points in the same game. Whose score is higher? How much higher?
32. MP.3 Critique Reasoning Frank reasoned that in the number 0.555, the value of the 5 in the thousandths place is ten times as great as the 5 in the hundredths place. Is he correct? Explain.
33. MP.3 Construct Arguments How many cubes are in the box? What fraction of the entire box do the 7 cubes represent? Explain your answer.
34. 0.04 is 10 times as great as which decimal?
𝖠 0.4
𝖡 0.1
𝖢 0.004
𝖣 0.001
35. 0.009 is 110 of which decimal?
𝖠 0.01
𝖡 0.09
𝖢 0.1
𝖣 0.9
31. Higher Order Thinking Kelly said that 97
1,000 can be written as 0.97. Is she correct? Explain.
21. Number Sense Tommy is beginning a science experiment in the lab. The instructions call for 0.322 kilogram of potassium. Write 0.322 as a fraction.
22. Mt. McKinley is the highest mountain peak in North America with an elevation of 20,320 feet. What is the value of the digit 3 in 20,320?
23. MP.3 Construct Arguments Jorge said that 0.029 can be written as 29
100. Is he correct? Explain.
25. MP.4 Model with Math What part of the entire square is shaded? Write your answer as a fraction and as a decimal.
24. MP.6 Be Precise The area of the continent of North America is about 9,540,000 square miles. Write 9,540,000 in expanded form using exponents to show powers of 10.
26. Higher Order Thinking Write the fractions 5
10, 5100, and 5
1,000 as decimals. How are the decimals related?
29. 0.003 is 110 of which decimal?
𝖠 0.3
𝖡 0.03
𝖢 0.33
𝖣 0.333
30. 0.8 is 10 times as great as which decimal?
𝖠 0.08
𝖡 0.88
𝖢 0.008
𝖣 0.888
27. A-ZA-Z Vocabulary Complete the sentence using one of the words below.
power base exponent
The number 1,000,000 is a(n) of 10.
28. Algebra In three months, Harold watched a total of 40 movies. If he watched 12 movies in June and 13 movies in July, how many movies did he watch in August? Write an equation using the variable a to model your work.