Envision Math 5th Grade Textbook Answer Key Topic 20.4 Problem Solving
Problem Solving
Use Objects
Answer:
A pentomino is an arrangement of 5 identical squares in a plane. The squares must be attached to one another edge to edge.
Question.
Using 5 identical square tiles, how can you build 3 more pentominoes that have 3 squares in a row?
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Guided Practice
Do you know HOW?
Question 1.
Is the following a pentomino? Explain.
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Question 2.
Are these two pentominoes the same or different? Explain.
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Do you UNDERSTAND?
Question 3.
In the example above, how many more pentominoes can you find with 3 in a row?
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Question 4.
Write a Problem Write a real-world problem that can be solved by using objects.
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Independent Practice
In 5 and 6, tell whether the pentominoes in each pair are related by a reflection or a rotation.
Question 5.
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Question 6.
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In 7 and 8, use objects to help you solve the problem.
Question 7.
How many pentominoes can you build with 5 in a row?
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Question 8.
How many pentominoes can you build with 4 in a row?
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Read and Understand
What am I asked to find?
Three more unique pentominoes that have 3 squares in a row
Two pentominoes are the same if they can be matched together by rotating or reflecting.
Plan and Solve
I can use objects to build 3 more pentominoes with 3 in a row.
Here are 3 possible solutions.
Look Back and Check
All are attached edge to edge.
All can be rotated and reflected. None are repeated.
The 3 pentominoes I’ve made are all unique.
Question 9.
Suppose each square in a pentomino is a table that seats one person on a side. Find a table arrangement (a pentomino) that can seat 12 people.
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Question 10.
The figure below can be folded to form a box. After it is folded, which face will be parallel to Face ABDC?
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Question 11.
Maureen is buying a game that is priced at $15. She has a coupon worth $2.50 off the regular price. After Maureen gives the clerk a $20 bill, how much change does she receive?
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Question 12.
James and Kurt were paid $176 for landscaping a yard. James worked 9 hours and Kurt worked 13 hours. How much is Kurt’s fair share of the earnings? James’s share?
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Question 13.
Use objects to build pentominoes with 2 squares in a row. How many of these kinds of pentominoes can be built?
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Question 14.
Make an organized list. How many different combinations of coins can make $0.42 if one of the coins is a quarter? One possible combination: 1 quarter, 17 pennies.
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Question 15.
At the concert, Mischa, Jordan, and Elijah are sitting together in a row. Make a list of the possible orders the three could be sitting.
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Question 16.
Estimation
A great white shark can weigh 4,400 lbs. A dolphin can weigh 440 lbs. About how many times as heavy is the shark as the dolphin?
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