5.4 Wrapping Up Multiplication and Division with MultiDigit Numbers
Unit Goals
 Students use the standard algorithm to multiply multidigit whole numbers. They divide whole numbers up to fourdigits by twodigits divisors using strategies based on place value and properties of operations.
Section A Goals
 Multiply multidigit whole numbers using the standard algorithm.
Section B Goals
 Divide multidigit whole numbers using strategies based on place value, properties of operations, and the relationship between multiplication and division.
Section C Goals
 Multiply and divide to solve realworld and mathematical problems involving area and volume.
Section A: Multidigit Multiplication Using the Standard Algorithm
Problem 1
Preunit
Practicing Standards: 4.NBT.A.1
Solution
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Problem 2
Preunit
Practicing Standards: 4.NBT.B.5
 \(27 \times 53\)
 \(518 \times 6\)
Solution
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Problem 3
Preunit
Practicing Standards: 4.NBT.B.6
Solution
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Problem 4
Preunit
Practicing Standards: 5.MD.C.5
Solution
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Problem 5
Preunit
Practicing Standards: 5.NF.B.3
 Explain or show how the drawing shows \(2 \div 5\).
 Explain or show how the drawing shows \(\frac{2}{5}\).
Solution
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Problem 6
 \(100 \times 50\)
 \(120 \times 50\)
 \(127 \times 50\)
Solution
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Problem 7
Solution
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Problem 8
Solution
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Problem 9
Solution
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Problem 10
Find the value of \(322 \times 41\) using the standard algorithm.
Solution
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Problem 11
Solution
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Problem 12
Solution
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Problem 13
Using the digits 1, 2, 3, 4, and 5 make a product that is close to 8,000.
Solution
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Problem 14
Solution
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Problem 15
Exploration
Jada remembers that the partial products algorithm can go from left to right or from right to left. She wonders if the standard algorithm can also go in either direction.
 Calculate \(418 \times 53\) using partial products right to left and left to right.
 Calculate \(418 \times 53\) with the standard algorithm. What happens if you try to make the calculation from left to right?
Solution
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Problem 16
Exploration
Clare has a strategy for multiplying a number by 99. To find \(648 \times 99\) she calculates \(648 \times 100\) and then subtracts \(648\).
 Use Clare's strategy to calculate \(648 \times 99\).
 Use the standard algorithm to calculate \(648 \times 99\).
 Which strategy did you prefer? Why?
Solution
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Section B: Multidigit Division Using Partial Quotients
Problem 1
 480 dancers make groups of 15. How many groups are there? Explain or show your reasoning.
 480 dancers make groups of 30. How many groups are there? Explain or show your reasoning.
Solution
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Problem 2
 Explain why \(256 \div 4\) is equivalent to \((200 \div 4) + (40 \div 4) + (16 \div 4)\).
 What is the value of \(256 \div 4\)? Explain your reasoning.
Solution
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Problem 3
Use partial quotients to find the value of \(243 \div 9\)
Solution
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Problem 4

Use partial quotients to find the quotient \(636 \div 12\).
 Can you use partial quotients to find \(636 \div 12\) in a different way?
Solution
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Problem 5
Solution
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Problem 6
Solution
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Problem 7
Exploration
 Andre made a noodle that was 102 feet long. The noodle broke into two pieces. One piece was 2 times as long as the other. How long were the two noodles? Explain your reasoning.
 Priya made a noodle that was 456 feet long. The noodle broke into two pieces. One piece was 5 times as long as the other. How long were the two noodles? Explain your reasoning.
Solution
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Problem 8
Exploration
Lin is calculating \(6,\!596 \div 68\). She calculates \(6,\!800  6,\!596\) and notices that it is \(3 \times 68\). Lin concludes that \(6,\!596 \div 68 = 97\).
 Explain Lin's reasoning.
 Use Lin's method to calculate \(7,\!448 \div 76\).
Solution
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Section C: Let’s Put it to Work
Problem 1
 About how many glasses of water do all of the students together drink in one day?
 About how many glasses of water do all of the students together drink in one week?
 About how many glasses of water do all of the students together drink in one month?
 About how long do you think it would take all of the students to drink 1,000,000 glasses of water?
Solution
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Problem 2
Colorado is 610 kilometers long and 450 kilometers wide.
 Recall that New Mexico is about 596 km long and 552 km wide. Do you think the area of Colorado is greater than or less than the area of New Mexico? Explain your reasoning.
 What is the area of Colorado?
Solution
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Problem 3
A large cargo ship can carry between 10,000 and 15,000 shipping containers. About how many cargo ships would be needed to carry the 210,000 containers of plastic the United States ships for recycling each year? Explain or show your reasoning.
Solution
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Problem 4
Exploration
Han reads that the length of Florida is 721 kilometers and its width is 582 kilometers. Han says "Florida is bigger than New Mexico!" Do you agree with Han? Explain or show your reasoning.
Solution
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Problem 5
Exploration
The Pentagon has 5 floors and the Empire State Building has 102 floors. Noah says that the Empire State Building is bigger. Do you agree with Noah? Investigate and justify your answer.
Solution
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