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.

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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