1. How do you take 15 away from 74 using a number line? 74 - 15 = ?

2. In this lesson you will learn how to solve subtraction problems by using a number line.

3. Let’s Review number line samples 79 80 81 82 83 84 85 86 87 88 89 90 50 60 70 80 90 100 110 120 130 140 150 160

4. A Common Misunderstanding Not paying attention to the scale on a given number line. 25 30 35 40 45 50 55 60 65 70 75 80 75 - 10 = 65

5. Counting the unit marks and not the spaces when using a number line. 25 26 27 28 29 30 31 32 33 34 35 36 34 - 4 = 30

6. Core Lesson 74 - 15 = ? 74 - 15 = 59 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75

7. 74 - 15 = ? 74 - 15 = 59 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 Think 75 - 15 = ? Remember to take one away later! Remember to take one away later!

8. Core Lesson To ride the roller coaster you must be 60 inches tall. Dana is 13 inches too short. How tall is she? 25 30 35 40 45 50 55 60 65 70 75 80 47 Think 60 - 13 = ? 60 - 13 = 47 Dana is 47 inches tall.

9. To ride the roller coaster you must be 60 inches tall. Dana is 13 inches too short. How tall is she? 25 30 35 40 45 50 55 60 65 70 75 80 47 Think 60 - 15 = ? 60 - 13 = 47 Dana is 47 inches tall. Remember to add 2 back later! Remember to add 2 back later!

10. In this lesson you have learned how to solve subtraction problems by using a number line.