To conclude the lesson, ask students to consider the
strategies they used to solve addition and subtraction
problems in the Workshop.
Ask questions such as the
following:
- Do you know how to use all the addition and subtraction
strategies?
- Which is your favorite strategy to use? Why?
- Is your favorite addition strategy different from
your favorite subtraction strategy?
- Did you use a different strategy during Path to
Glory than you did to solve problems in Difference
War? (Possible response: I used mental math during
Path to Glory and paper and pencil during
Difference War.)
- Could you pick one strategy and use it to solve
every problem? (probably)
- Do some strategies work better for some kinds of
problems? (yes)
- Was there a way that was more difficult or confusing?
- Does one way help you solve the problem more
quickly?
Allow time for students to complete the Multidigit
Addition and Subtraction Quiz independently.
Provide access to tools such as base-ten pieces and
encourage students to use both their Addition
Strategies Menu and Subtraction Strategies Menu
for Larger Numbers from the Student Activity Book
Reference section.
Use the Multidigit Addition and Subtraction Quiz with the
Feedback Box in the Student Activity Book to assess
students' abilities to use and apply place value concepts to
make connections among representations of multidigit
numbers using base-ten pieces, number lines, expanded
form, and standard form [E1]; represent addition problems
using base-ten pieces and number lines [E5]; add and
subtracting multidigit numbers using mental math strategies
with base-ten pieces and number lines [E6]; add and subtract
multidigit numbers using paper-and-pencil methods [E7];
find a strategy [MPE2]; estimate to check for reasonableness
[MPE3]; use addition to check subtraction calculations
[MPE4]; and show solution strategies [MPE5].
