Lesson Plan: Estimating and Counting Objects up to 100
Main Focus: The main focus of this lesson is to help students develop the skills of estimating and counting a number of objects up to 100.
Prior Knowledge: Students should have prior knowledge of reciting and reading numbers up to 100 and counting objects, matching onetoone.
Key Vocabulary: estimate, count, more, less
Curriculum Objectives:  N2.1A: Count in steps of 2 from 0, in steps of 5 from 0, and in steps of 10 from 0.  N2.1C: Recognize patterns in digits when counting in 2s from 0 (and so identify odd and even numbers), 5s from 0, and 10s from 0, from any number forwards and backwards.
Materials Needed:  Counting objects (e.g., counters, cubes, buttons, etc.)  Whiteboard or chart paper  Markers  Worksheets or activity sheets
Procedure:

Introduction (5 minutes):  Begin the lesson by reviewing the concept of counting and reciting numbers up to 100. Ask students to recite numbers from 1 to 100 together as a class.  Introduce the concept of estimating and explain that estimating means making a guess or approximation of a number.

Estimating Activity (10 minutes):  Show students a jar filled with a certain number of objects (e.g., buttons, counters, etc.).  Ask students to estimate how many objects are in the jar. Write their estimates on the whiteboard or chart paper.  Count the objects in the jar together as a class and compare the actual count with the estimates. Discuss which estimates were close and which were far off.

Counting in Steps Activity (15 minutes):  Divide the class into small groups and provide each group with a set of counting objects.  Instruct the groups to count the objects in steps of 2, 5, and 10. Encourage them to use the objects to physically count and practice counting aloud.  After each round of counting, have the groups share their results with the class. Write the numbers on the whiteboard or chart paper.  Discuss the patterns that emerge when counting in steps of 2, 5, and 10. Help students identify odd and even numbers.

Independent Practice (15 minutes):  Distribute worksheets or activity sheets to each student.  Instruct students to estimate and count the number of objects in each question.  Circulate the classroom to provide assistance and monitor student progress.

Conclusion (5 minutes):  Gather the class together and review the concepts of estimating and counting in steps of 2, 5, and 10.  Ask students to share any patterns or observations they made during the lesson.  End the lesson by emphasizing the importance of estimating and counting accurately in reallife situations.
Note: This lesson plan can be modified and adapted to suit the specific needs and abilities of the secondgrade students.