1. This math story problem has two steps, both adding and subtracting. Can you solve two step problems using an open number line? Add 23 and 35 and take away 15.

2. In this lesson you will learn to solve two step math stories by using an open number line.

3. Let’s Review Add 13 and 88 88 98 99 100 101 88 + 13 = 101

4. Take away 13 from 88 88 78 77 76 75 88 - 13 = 75

5. A Common Misunderstanding Not matching the direction on the number line with the action in the math story. ? Take apart - Put together +

6. Core Lesson Add 23 and 35 then take away 15 more. 35 45 55 48 43 58 23 + 35 = 58 and 58 -15 = 43

7. Lindsay planted a sun flower seed and watched it grow. After three weeks it was 16 inches tall. By 8 weeks it had grown 57 more inches! Lindsay picked the flower taking 24 inches off the sun flower. How tall was the plant then? + -

8. 16 inches 57 inches

9. Core Lesson Grew 16 inches and 57 inches 57 67 73

10. 73 inches tall Cut 24 inches off

11. 16 + 57 = 73 inches 57 67 73 Picked the flower by cutting 24 inches off 53 63 49 After Lindsay picked the flower the sunflower plant was 49 inches tall.

12. In this lesson you have learned to solve two step math stories by using an open number line.