Students can use the Spectrum Math Grade 3 Answer Key Chapter 5 Lesson 5.7 Problem Solving as a quick guide to resolve any of their doubts.
Spectrum Math Grade 3 Chapter 5 Lesson 5.7 Problem Solving Answers Key
Make a mental computation first. Then, solve the problem.
In 4 days, Paige saw a total of 32 skydivers. In 4 more days she saw another total of 32 skydivers. If she saw the same number of skydivers each day, how many skydivers did Paige see in one day?
I know 30 plus 30 is 60, and 2 plus 2 is 4, so 32 plus 32 is 64. There are 8 total days, so I need to divide 64 by 8. I know 8 times 8 is 64, so 64 divided by 8 is 8.
Mental Computation: 8
Question 1.
Emma has 50 photos in one box and 10 photos in another. She wants to put an equal number of photos on each of the 10 pages of her album.
How many photos should Emma put on each page?
Mental Computation: ______________
Emma should put ______________ pictures on each page.
Answer: Mental Computation: 6.
Emma should put 6 pictures on each page.
Explanation: Given that,
Emma has 50 photos in one box and 10 photos in another.
She wants to put an equal number of photos on each of the 10 pages of her album.
Now, we will find out how many photos Emma put on each page.
So, the mental computation is,
50 + 10 = 60 total photos.
Next, she wants to put an equal number of photos on each of the 10 pages.
i.e., 60/10
Therefore, Emma should put 6 pictures on each page.
Question 2.
A group of 10 third graders is making cardboard penguins. Each student needs 1 cardboard tube, 2 wiggle eyes, and 1 piece of construction paper. How many items do all 10 third graders need?
Mental Computation: _______________
All 10 third graders need ___________ items for the penguin project.
Answer: Mental Computation: 40.
All 10 third graders need 40 items for the penguin project.
Explanation: As given in the question,
A group of 10 third graders is making cardboard penguins.
Each student needs 1 cardboard tube, 2 wiggle eyes, and 1 piece of construction paper.
Now, we will find out how many items all 10 third graders needed.
So, the mental computation is,
1 cardboard x 10 = 10 cardboards.
2 wiggle eyes x 10 = 20 wiggle eyes.
1 piece of construction paper x 10 = 10 construction paper pieces.
Next, we will find the total number of items,
i.e., 10 + 20 + 10 = 40 items.
Hence, all 10 third graders need 40 items for the penguin project.
Question 3.
Greg has 91 erasers, and Janelle gives him 8 more. Greg gives each of his 9 friends an equal number of erasers. How many erasers does each friend get?
Mental Computation: _______________
Each friend gets _____________ erasers.
Answer: Mental Computation: 11
Each friend gets 11 erasers.
Explanation: As given in the question,
Greg has 91 erasers, and Janelle gives him 8 more.
Greg gives each of his 9 friends an equal number of erasers.
Now, we need to find out how many erasers each friend gets.
So, the mental computation is,
91 + 8 = 99 erasers.
Now, we will find each friend gets how many erasers,
i.e., 99/9
Thus, each friend gets 11 Erasers.
Question 4.
There were 21 skiers waiting in line for the ski lift. Three skiers can sit on each seat on the lift. How many seats are needed for all of the skiers?
Mental Computation: _______________
_____________ seats are needed for all of the skiers.
Answer: Mental Computation : 7
7 seats are needed for all of the skiers.
Explanation: Given that,
There were 21 skiers waiting in line for the ski lift.
Three skiers can sit on each seat on the lift.
Now, we will find out how many seats are needed for all of the skiers.
So, the values are 21 and 3,
i.e., 21/3
Hence, 7 seats are needed for all of the skiers.