## Math Expressions Common Core Grade 4 Unit 3 Lesson 10 Answer Key Mixed Problem Solving

**Math Expressions Grade 4 Unit 3 Lesson 10 Homework**

When the Kent Elementary School fourth-grade classes were studying butterflies, they took a field trip to a butterfly garden.

Use the correct operation or combination of operations to solve each problem.

Question 1.

Nine buses of students, teachers, and parents went on the field trip. If 5 of the buses held 63 people each and the other buses held 54 people each, how many people went in all?

Answer:

531 people went in all

Explanation:

Question 2.

Some female butterflies lay their eggs in clusters. If one kind of butterfly lays 12 eggs at a time and another kind lays 18 eggs at a time, how many eggs would 8 of each kind of butterfly lay?

Answer:

240 eggs would 8 of each kind of butterfly lay

Explanation:

Question 3.

Teachers divided students into groups of 3. Each group of 3 wrote a report that had 9 pictures in it. The students used 585 pictures altogether. How many students were there in all?

Answer:

195 students were there in all

Explanation:

Question 4.

Driving to and from the butterfly garden took 45 minutes each way. The students spent 3 hours in the garden and 30 minutes eating lunch. If the groups left the school at 9:00 A.M., what time did they get back?

Answer:

They get back at 2:00 PM

Explanation:

**Math Expressions Grade 4 Unit 3 Lesson 10 Remembering**

**Add or subtract.**

Question 1.

Answer: 3,674

Explanation:

By subtracting smaller number 2,159 from bigger number 5,833

We get 3,674

Question 2.

Answer: 65,460

Explanation:

By adding 15,658 to 49,802

We get 65,460

Question 3.

Answer: 70,794

Explanation:

By subtracting smaller number 27,345 from bigger number 98,139

We get 70,794

**Sketch rectangles and solve by any method that relates to your sketch.**

Question 4.

5 × 6,294 _______

Answer: 31470

Explanation:

Rectangle = length x breath

Question 5.

8 × 1,375 ________

Answer: 11000

Explanation:

**Solve. Then explain the meaning of the remainder.**

Question 6.

Vince has 138 artist trading cards. He ¡s arranging them in an album that can hold 4 to a page. If Vince fills each page as he goes, how many cards are on the last page?

Answer:

2 cards are on the last page, in the remainder 2 is left, it means the 2 cards are on the last page

Explanation:

Question 7.

Amber is doing an online math drill program. She has exactly 300 seconds to complete as many problems as she can. If it takes Amber 7 seconds to do each problem, how many problems does she complete?

Answer:

Question 8.

**Stretch Your Thinking** In the fall, Wesley swam a race in 58 seconds, and Aiden swam it in 54 seconds. In the spring, they swam the same race. Wesley did it in 53 seconds, and Alden did it in 52 seconds. How much more of an improvement was one boy’s race time over the other boy’s race time? Explain.

Answer: 3 seconds

Explanation: