Unit 4 Contents

7. Mrs. Haddad preferred to use a Base-Ten Recording Sheet. However, she soon noticed that drawing columns on the Base-Ten Recording Sheet was not necessary if she always used the Fewest Pieces Rule. Mrs. Haddad called this the compact paper-and-pencil method for addition. She wrote the problem like this:
   
1. Look at Mrs. Haddad's work. Can you explain how she got her answer?
2. Mrs. Haddad wrote two small “ones” above the 9 and 4. Can you explain what she meant when she wrote them?
3. What base-ten pieces would Mrs. Haddad use to show what the two small “ones” mean?
8. Solve these problems using Mrs. Haddad's method, the compact paper-and-pencil method.
1. 56 + 38
2. 87 + 414
3. 258 + 327
4. 347 + 285

For the following questions, refer to the Addition Strategies Menu in your Student Activity Book.

9. The students from Livingston School and Stanley School are going on a field trip. There are 765 students at Livingston School and 895 students at Stanley School.
1. How many students are going on the field trip altogether? Maya and John began to describe how they solved Question 9A.
   
2. Finish Maya's solution.
3. Finish John's solution.
4. Which strategy did you like better?