Unit 2 Contents

3. Here is Tara's strategy for adding 18 + 5.

• 
1. What was Tara's first move on the number line?
2. Where did she go next? Why?
3. How did she know how much farther to go on her last move?
4. What other strategies can you use to add 18 + 5?
4. Use Tara's strategy on a number line to solve 29 + 4.
1. 5 + 7 =
2. 25 + 7 =
3. 6 + 9 =
4. 16 + 9 =
5. 8 + 3 =
6. 38 + 3 =

True or False?

Decide if each sentence is true or false. Be ready to justify your answer using tools or strategies.

1. 12 = 5 + 7
2. 15 + 7 = 23
3. 6 + 6 = 5 + 7
4. 6 + 6 = 5 + 5 + 2
5. 7 + 5 = 10 + 4
6. 7 + 5 = 10 + 3
1. 9 + 5 = 15
2. 14 = 5 + 9
3. 9 + 5 = 10 + 4
4. 9 + 5 = 4 + 5 + 5
5. 19 + 5 = 20 + 5
6. 19 + 5 = 20 + 4
8. Show or tell why your answer is correct for Question 7F.