Students can use the Spectrum Math Grade 3 Answer Key Chapter 4 Lesson 4.9 Two-Step Problem Solving as a quick guide to resolve any of their doubts.
Spectrum Math Grade 3 Chapter 4 Lesson 4.9 Two-Step Problem Solving Answers Key
Make a mental computation first. Then, solve each problem.
The PE teacher gave each team 6 basketballs and 6 tennis balls. If there were 5 teams, how many total balls did the PE teacher give out?
Each team gets 6 of each type of ball. I know that 6 times 5 is 30, so that is 30 basketballs and 30 tennis balls. Then, I can add the balls together, and 30 plus 30 is 60. So, there are 60 balls in all.
Mental Computation: 60
Question 1.
Eight girls and 5 boys each have a button collection. Each girt has 8 buttons in her collection, and each boy has 4 buttons in his collection. How many buttons altogether do the boys and girls have?
Mental Computation: ______________
The boys and girls have ____________ buttons altogether.
Answer:
Given that,
Eight girls and 5 boys each have a button collection.
Each girt has 8 buttons in her collection.
Each boy has 4 buttons in his collection.
I know that 8 times 8 is 64, so that is 64 buttons in girls collection.
And 5 times of 4 is 20, So that is 20 buttons in boys collection.
Then, I can add the buttons together, and 64 plus 20 is 84. So, there are 84 balls in all.
Mental Computation: 84.
The boys and girls have 84 buttons altogether.
   
 
Question 2.
There are 2 rows of 5 computers in each office. If there are 7 offices in the building, how many computers are in the building altogether?
Mental Computation: ______________
There are _____________ computers in the building.
Answer:
Given that,
There are 2 rows of 5 computers in each office.
The number of computers in each office is 2 x 5 = 10.
The number of computers in 7 offices is 7 x 10 = 70.
I know that 2 times of 5 is 10. So 10 computers in each office.
And 7 times of 10 is 70. So, 70 computers in 7 offices. The number of computers are 70.
Mental Computation: 70
There are 70 computers in the building.
Question 3.
Kayla bought 5 bags of dried mango slices. Each bag has 7 slices. How many mango slices does Kayla have left over after she gives away 10 slices?
Mental Computation: ______________
Kayla has ___________ mango slices left.
Answer:
Given that,
Kayla bought 5 bags of dried mango slices.
Each bag has 7 slices.
she gives away 10 slices
I know that 5 times of 7 is 35. So there are 35 dried mango slices.
And 35 minus 10 equal to 25. Therefore there are 25 mango slices left.
Mental Computation: 25
Kayla has 25 mango slices left.
Question 4.
Jin bought 7 boxes of Mixed Mints and 4 boxes of Fudge Crunchies. Each Mixed Mints box has 10 cookies and each Fudge Crunchies box has 7. How many cookies does Jin have altogether?
Mental Computation: _______________
Jin has _____________ cookies altogether.
Answer:
Given that,
Jin bought 7 boxes of Mixed Mints and 4 boxes of Fudge Crunchies.
Each Mixed Mints box has 10 cookies.
Each Fudge Crunchies box has 7.
I know that 7 times of 10 is 70. So, there are 70 cookies in Mixed Mints box.
And 4 times of 7 is 28. So, there are 28 cookies in Fudge Crunchies box.
Know add the total cookies that is 70 plus 28 is 98. The total cookies are 98.
Mental Computation: 98
Jin has 98 cookies altogether