Unit 10 Contents

Use mental math or paper and pencil to solve the problems. Write a number sentence to show your work. Write your answers in simplest form. Use addition or estimation to check for reasonableness.

1. John packed a water jug with 3 liters of water. By the end of the day, he had 1 liters of water left in his water jug. How much water did he use?
2. Show how to check the problem in Question 3A with addition.
1. John hiked for 3 hours on Saturday and 4 hours on Sunday. How many more hours did he hike on Sunday than on Saturday?
2. Show how to check the problem in Question 4A with addition.
1. Tall Spruce Trail is 7 miles long. Mark has hiked 2 miles along the trail. How many miles of the trail are left?
2. Show how to check the problem in Question 5A with addition.
6. Mark is waiting for John at mile marker 3 . John is at mile marker 2 . How much farther does John have to walk to meet Mark?
7. Mark's walking stick is 3 feet long. John's walking stick is 3 feet long. Whose walking stick is longer? How much longer?

Check-In: Questions 8–11

Solve the following problems using paper and pencil or mental math. Write all your answers in simplest form.

8. 3 + 2 =
9. 
10. 5 + 2 =

11. Look at Question 9. Is your answer reasonable? Explain.

Play Game 1 of Closest To in the Student Activity Book to practice estimating mixed number differences.