Add and subtract within 1000, using concrete models or drawings
and strategies based on place value, properties of operations, and/or
the relationship between addition and subtraction; relate the strategy
to a written method. Understand that in adding or subtracting three digit
numbers, one adds or subtracts hundreds and hundreds, tens
and tens, ones and ones; and sometimes it is necessary to compose or
decompose tens or hundreds.
| Name |
Description |
| The Kingdom of Ten | This is a lesson about the power of grouping numbers into ones, tens, and hundreds. The story describes the terrible dilemma faced by Lady Di as she attempts to feed the large number of guests that arrive for King Arthur's birthday party. The knights attempt to help her count the guests by arranging the people in different ways until a final solution is found by using the power of ten and place value. The children are then given the opportunity to count people arriving from other lands by using place value blocks. Finally, the children make a number and have just a few more guests arrive from the land of Addington. They can then fill up their place value houses and watch as they must shift or regroup the people to make them fit into the proper houses. |
| How Much Do We Need to Order? | This is an inquiry lesson in which the students will be posed a real world problem and be given the task to come up with a way to gather their data and solve the problem. |
| Pirate Party! - Let's Make a Ten | This lesson teaches students how to apply the "make-a-ten" strategy to addition problems involving two-digit addends. |
| Roll and Add Two Digit Numbers | In this lesson students will use two dice to roll and add two-digit numbers. Students will also use their numbers to create and solve one-step addition word problems. |
| Cookie Contest | This MEA asks students to decide which factors are important in choosing the best cookie in a cookie contest. Students will take on the role of cookie critics to provide feedback to a teacher whose grade level is deciding which cookie to use for a fundraiser. They will rank order their choices from the best to worst cookie. Students will provide a detailed written explanation for how they decided to rank factors and their solution. They will show their work while adding up to 4 two-digit numbers to calculate the total number of votes. Model Eliciting Activities, MEAs, are open-ended, interdisciplinary problem-solving activities that are meant to reveal students’ thinking about the concepts embedded in realistic situations. Click here to learn more about MEAs and how they can transform your classroom. |
| Strategy-Based Instruction In Three-digit Subtraction | Students will learn how to subtract three-digit subtraction problems using various subtraction strategies (expanded form and place value). These strategies help to build conceptual understanding, which will benefit in the development of their understanding of the standard algorithm. |
