By the end of this lesson, students will be able to add and subtract two-digit numbers using concrete models.

Materials

Concrete models of numbers (e.g. physical manipulatives such as blocks, or visual representations such as drawings or digital images)

Worksheets for practice

Warm-up

Review the concept of place value and the concept of counting by rote (e.g. count to 100 by tens, then by ones)

Ask students to count to a certain number using the correct method, then have them demonstrate their counting method by using concrete models or digital representations

Direct Instruction

Introduce the concept of calculation and the various methods of calculating with numbers (e.g. addition, subtraction, multiplication, division)

Show and demonstrate the use of concrete models or digital representations to solve problems

Demonstrate how to use place value to perform calculations

Guided Practice:

Show and have the students work with the teacher to solve a series of problems using concrete models or digital representations

Independent Practice:

Have the students work in pairs to solve a series of problems using manipulatives or digital representations. They can check their answers with the teacher and discuss their reasoning.

Closure

Review the concept of place value and how it is used to represent numbers. Have the students give examples of how they would represent different numbers using place value.

Ask the students to share a challenge they faced while solving the math problems and how they overcame it.

Assessment

Observe the students during the independent practice to assess their understanding of place value and how to use it to represent numbers.

Collect and review the students' math problems to assess their ability to solve -simple addition and subtraction problems.

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