This handy **Spectrum Math Grade 4 Answer Key Chapter 1 Lesson 1.9 Problem Solving** provides detailed answers for the workbook questions.

## Spectrum Math Grade 4 Chapter 1 Lesson 1.9 Problem Solving Answers Key

**Solve each problem.**

Question 1.

Isabel Jones needs to sell 175 calendars to raise money for the school band. She already sold 89 calendars. How many more calendars does she have to sell?

She has to sell __________ more calendars.

Answer:

86

Explanation:

There are total 175 calendars.

Isabel Jones already sold 89 calendars.

She has to sell 86 more calendars.

175 – 89 = 86

Question 2.

Jacob Elementary School had a book drive. On Monday, the students collected 95 books. They collected 78 more books on Tuesday. How many books did the students collect?

The students collected __________ books.

Answer:

173

Explanation:

On Monday, the students collected 95 books.

On Tuesday, the students collected 78 books.

Totally the students collected 173 books.

95 + 78 = 173

Question 3.

The Grover family went on a sprin9 vacation. Their cabin is 305 miles away. If they drive 98 miles the first day, how many more miles do they have to drive to get to the cabin?

They must drive __________ more miles.

Answer:

207

Explanation:

The Grover family cabin is 305 miles away.

They drived 98 miles the first day.

They must drive 207 more miles to get to the cabin.

305 – 98 = 207

Question 4.

The school cafeteria had an all-you-can-eat pizza party for the entire school. They made 215 slices of cheese pizza and 120 slices of pepperoni pizza. How many slices of pizza did they make?

They made __________ slices of pizza.

Answer:

335

Explanation:

The school cafeteria made 215 slices of cheese pizza.

They made 120 slices of pepperoni pizza.

Totally they made 335 slices of pizza.

215 + 120 = 335

Question 5.

There are 300 species of turtles and tortoises in the world. If there are 86 species listed as endangered, how many species of turtles and tortoises are not endangered?

There are ____ species of turtles and tortoises that are not endangered.

Answer:

214

Explanation:

There are 300 species of turtles and tortoises in the world.

If there are 86 species listed as endangered, then

there are 214 species of turtles and tortoises that are not endangered.

300 – 86 = 214