Practicing the Bridges in Mathematics Grade 4 Student Book Answer Key Unit 7 Module 3 will help students analyze their level of preparation.
Bridges in Mathematics Grade 4 Student Book Answer Key Unit 7 Module 3
Bridges in Mathematics Grade 4 Student Book Unit 7 Module 3 Session 1 Answer Key
Multiplication Story Problems Record Sheet
Question 1.
Use sketches and numbers to solve each of these story problems with your class.
a
b
c
Answer:
Single-Digit Multiplication
Question 1.
Use a sketch and numbers to solve the problems below. Follow the example.
Answer:
Explanation:
By using a sketch and numbers we have solved the problems above.
Question 2.
Use numbers to solve these problems.
Answer:
Explanation:
We have solved the problem using the given numbers.
Double-Digit by Single-Digit Multiplication
Question 1.
Use a sketch and numbers to solve the problems below. Follow the example.
Answer:
Explanation:
We have used a sketch and numbers to solve the problems below.
Question 2.
Use numbers to solve these problems.
Answer:
Explanation:
We have solved the given numbers
Bridges in Mathematics Grade 4 Student Book Unit 7 Module 3 Session 2 Answer Key
Roll Your Own Multiplication Problems
For the problems below:
- Choose a die numbered 1-6 or 4-9.
- Roll it as many times as you need to fill in each of the boxes below. You can write each number you roll in any box on the sheet, but once all the boxes are filled, you can’t change them.
- Use the method you just learned in class to solve your problems.
- When you’re finished, trade papers with a classmate and have him or her check your answers.
Answer:
Here, we have chosen a die numbered 1-6 or 4-9 and rolled it as many times as we needed to fill in each of the boxes below then we wrote each number that was rolled in any box on the sheet, but once all the boxes are filled, we haven’t change them.
Question 1.
CHALLENGE Use each of these digits just one time: 0 1 2 3 4 5 6 7 8 9 Write them in the empty spaces below to make each problem correct.
Answer:
Explanation:
We used each of these digits just one time: 0 1 2 3 4 5 6 7 8 9 and wrote them in the empty spaces below to make each problem correct.
Practice with the Standard Algorithm
Maddie and her mom got 6 boxes of treats for their dogs. There are 34 treats in each box. How many treats did they get for their dogs?
To solve this problem, multiply 6 × 34. Here are two different methods:
Question 1.
You can make a sketch and list the partial products. Then you can add them.
Question 2.
You can also multiply by using the standard algorithm. If you use this method, you don’t have to list the partial products.
Multiply the ones. 6 × 4 = 24 ones. Since 24 is 2 tens plus 4 ones, write the 4 in the ones place and write the 2 tens above the 3 in the tens place.
Multiply the tens. 6 × 3 = 18 tens. Add the 2 tens you carried over to the 18 tens. Write 20 tens in the tens and hundreds place.
Use the standard algorithm to solve the problems below.
Answer:
Explanation:
We have multiplied the given numbers. Check the above for more explanation.
Bridges in Mathematics Grade 4 Student Book Unit 7 Module 3 Session 3 Answer Key
Multiplication Methods
Here are three different ways to solve 4 × 199.
Question 1.
Use the standard algorithm to solve each problem below. Then solve it a different way. Label your method. Circle the method that seemed quicker and easier.
a.
Standard Algorithm: _______________
A Different Way: _______________
Answer:
The product of 37 and 4 is 148.
Explanation:
By multiplying 37 and 4 using standard algorithm, so the product will be 148.
To know the product of 37 and 4 we will use partial product which is
4 × 30 = 120,
4 × 7 = 28
120+28 = 148.
b.
Standard Algorithm: _______________
A Different Way: _______________
Answer:
The product of 63 and 7 is 441.
Explanation:
By multiplying 63 and 7 using standard algorithm, so the product will be 441.
To know the product of 63 and 7 we will use partial product which is
7 × 60 = 420,
7 × 3 = 21,
420+21 = 441.
c.
Standard Algorithm: _______________
A Different Way: _______________
Answer:
The product of 299 and 6 is 1,794.
Explanation:
By multiplying 299 and 6 using standard algorithm, so the product will be 1794.
Here, we will use over strategy to find the product of 299 and 6 which is
as 299 is almost 300, so
300×6 = 1800,
1800-6 = 1,794.
d.
Standard Algorithm: _______________
A Different Way: _______________
Answer:
The product of 749 and 7 is 5,243.
Explanation:
By multiplying 749 and 7 using standard algorithm, so the product will be 5,243.
Here, we will use partial product which is
7 × 700 = 4900,
7 × 40 =  280,
7 × 9  =  63
4900+280+63 = 5,243.
Question 2.
Fill in the bubble to show the best estimate for each problem.
a.
200
250
300
350
Answer:
300.
Explanation:
The product of 43 and 7 is 301, so the best estimated product is 300.
b.
700
800
900
1,000
Answer:
900.
Explanation:
The product of 226 and 4 is 904, so the best estimated product will be 900.
Question 3.
The fourth and fifth graders at King School went to the museum yesterday in 7 buses. There were 65 students on each bus. How many students were there in all? Write and solve an equation for this problem. Show all your work.
Answer:
The equation is 65×7 = 455.
Explanation:
Given that the fourth and fifth graders at King School went to the museum yesterday in 7 buses and there were 65 students on each bus. So the number of students were in all is 65×7 which is 455 students. The equation is 65×7 = 455.
Question 4.
CHALLENGE The big building downtown has 27 floors. There are 8 offices on each floor. Each office has 8 computers. How many computers are there in all? Write and solve an equation for this problem. Show all your work
Answer:
The equation will be (27×8)×8 = 1,728.
Explanation:
Given that the big building downtown has 27 floors and there are 8 offices on each floor which is 27×8 = 216 offices. And each office has 8 computers which is 216×8 = 1,728 computers in all. So the equation will be (27×8)×8 = 1,728.
Two Different Multiplication Methods
Question 1.
Solve each problem below. Use the standard algorithm at least two times. Use the partial products method at least two times.
Answer:
Explanation:
We have solved each problem below by using the standard algorithm at least two times and using the partial products method at least two times.
Question 2.
Ramon bought 8 big cases of breakfast cereal. Each case held 12 boxes of cereal. How many boxes of breakfast cereal did Ramon buy?
- Restate the question in your own words:
- Underline the information in the problem you do need to solve the problem.
- Cross out the information in the problem you don’t need to solve the problem.
- Solve the problem. Show all your work.
Answer:
The number of boxes Ramon bought is 96 boxes.
Explanation:
Given that Ramon bought 8 big cases of breakfast cereal and each case held 12 boxes of cereal. So the number of boxes of breakfast cereal did Ramon bought is 12×8 which is 96 boxes.
Bridges in Mathematics Grade 4 Student Book Unit 7 Module 3 Session 4 Answer Key
Double-Digit Multiplication Sketches
Question 1.
Mr. Green’s 1st grade classroom is 18 feet wide and 24 feet long. He is planning to divide it into 4 sections. Here is his plan. Write a multiplication equation in each section to show its area in square feet.
Answer:
The multiplication equation will be 200+160+40+32 = 432.
Explanation:
The multiplication equation will be
10×20 = 200
8×20 = 160
10×4 = 40
8×4 = 32
which is 200+160+40+32 = 432.
a. What is the total area of the 18-by-24-foot classroom? Show your work.
Answer:
The total area of the classroom is 432 sq ft.
Explanation:
Given that Mr. Green’s 1st grade classroom is 18 feet wide and 24 feet long. So the area of the classroom is 18×24 which is 432 sq ft.
Question 2.
Write the answers.
Answer:
Explanation:
Check the above figure for the multiplication of the given numbers.
Question 3.
Sketch an array for each of the frames below. Label each part with a multiplication equation to show its area. Then find the total area of the array.
total area = ______________
Answer:
The total area is 368.
Explanation:
The total area of the array is 23×16 which is 368.
total area = ______________
Answer:
The total area is 266
Explanation:
The total area of the array is 19×14 which is 266.
total area = ______________
Answer:
The total area is 308.
Explanation:
The total area of the array is 22×14 which is 308.
Question 4.
Write the answers.
Answer:
Explanation:
The multiplication for the given numbers is the above figure.
Multiples of Ten & More
Question 1.
Write the answers.
Answer:
Explanation:
The multiplication for the given table is done in the above figure.
Question 2.
Multiply each number in the top row by the number at the left. The first one is done for you as an example.
Answer:
Explanation:
We have multiplied each number in the top row by the number at the left. Check the given figure for more answers.
Question 3.
Tyrone says you can use the answers in the first two charts of problem 2 to help figure out the answers in the third row. Do you agree with him? Why or why not?
Answer:
Yes, I agree with Tyrone. Because by adding chart 1 and chart 2 we will get the third row.
Bridges in Mathematics Grade 4 Student Book Unit 7 Module 3 Session 5 Answer Key
Double-Digit Multiplication
Question 1.
Find the product of each pair of numbers below. Make a labeled sketch to help, or just use numbers. Show all of your work.
a.
Answer:
Explanation:
The multiplication of the given two digit numbers is 648.
b.
Answer:
Explanation:
The multiplication of the given two digit numbers is 828.
c.
Answer:
Explanation:
The multiplication of the given two digit numbers is 675.
d.
Answer:
Explanation:
The multiplication of the given two digit numbers is 408.
e.
Answer:
Explanation:
The multiplication of the given two digit numbers is 828.
Question 2.
Solve the story problems below. Make a labeled sketch to help, or just use numbers. Show all of your work.
a. Tonya works at a sporting goods store in the mall. Last week, she unpacked 28 boxes of new sweatpants. Each box had 24 pairs of sweatpants in it. How many pairs of sweatpants did she unpack?
Answer:
Tonya has 672 new sweatpants unpacked.
Explanation:
Given that Tonya works at a sporting goods store in the mall and in last week, she unpacked 28 boxes of new sweatpants. In each box Tonya had 24 pairs of sweatpants. So the number of pairs of new sweatpants unpacked are 28×24 which is 672 pairs.
b. Tonya made 23 stacks of sweatshirts. She put 17 shirts in each stack. How many shirts did she stack in all?
Answer:
The number of shirts did she stack in all is 391 shirts.
Explanation:
Given that Tonya made 23 stacks of sweatshirts and she put 17 shirts in each stack. So the number of shirts did she stack in all is 23×17 which is 391 shirts.
c. CHALLENGE Then Tonya made 24 stacks of shorts. She put 16 pairs of shorts in each stack. The store she works for had to pay $4.99 for each pair of shorts. How much did they have to pay for all the pairs of shorts Tonya stacked?
Answer:
Tonya will pay $1,916.16.
Explanation:
Given that Tonya made 24 stacks of shorts and she put 16 pairs of shorts in each stack. So the number shorts will be 24×16 which is 384 pairs shorts and she pays $4.99 for each pair. So Tonya will pay 4.99×384 which is $1,916.16.
Four Partial Products Practice
Multiply to get four partial products and add them up. The first one has been done for you as an example.
Answer:
Explanation:
We have multiplied to get four partial products and added them up. Check the other answers in the given figure.