1. Zim had 19 marbles. He gave 6 marbles to his friend Lilly. How many do I have left?

2. In this lesson you will learn to subtract by counting up to a ten.

3. Let’s Review 5 + 5 = 10 3 + 7 = 10 How many ways can you make 10 ? Tens are friendly numbers that help us add and subtract. 10 + 10 = 20

4. A Common Misunderstanding Thinking that numbers can be subtracted in any order. 7 – 3 = 7 - 4 7 - 3 = 4 7 - 4 = 3

5. Core Lesson Counting back from a friendly number makes subtracting easier. 50201510 4 3 9 - 6 = ? 3 -6 +1 10 - 6 = 4 -1

6. Core Lesson 18 - 6 =? 12 + 2 20 -6 - 2 = 14 We can use any 10 to make subtracting easier. 10, 20, 30…

7. Zim had 19 marbles. He gave 6 marbles to his friend Lilly. How many marbles do I have left? 19 + 1 = 20 19 - 6 = ? 13 20 - 6 = 14 14 -1 =13 I have 13 marbles left!

8. In this lesson you have learned to subtract by counting up to a ten.