Overview

This 90-minute collaborative session with 3 students introduces and reinforces foundational addition strategies aligned with Common Core State Standards (CCSS). The lesson emphasizes hands-on, interactive problem solving, helping students internalize counting on, making ten, and number line methods for addition.

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Grade Level

K-2 (activities differentiated within the grade band)

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Common Core Standards Addressed

• K.OA.A.1: Represent addition and subtraction with objects, fingers, mental images, drawings, sounds, acting out situations, verbal explanations, expressions, or equations.
• K.OA.A.2: Add and subtract within 10, using objects or drawings to represent the problem.
• 1.OA.C.5: Apply properties of operations as strategies to add and subtract (e.g., making ten).
• 1.OA.C.6: Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.
• 2.NBT.B.5: Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

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Learning Objectives

By the end of this lesson, students will:

1. Demonstrate understanding of addition using counting on, making ten, and number lines.
2. Solve addition problems within 20 using at least two different strategies.
3. Explain and justify their addition strategy choices during problem solving.
4. Build confidence in flexible thinking when approaching addition.

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Materials Needed

• Number cards (0-20)
• Counters (e.g., small cubes or beans)
• Large laminated number line (0-20)
• Whiteboard & markers
• Individual mini number lines printed for each student
• Addition problem cards (with visual supports)
• Strategy choice chart (visual guide for counting on, making ten, number line)

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Lesson Breakdown

Time	Activity	Description & Strategy	CCSS Alignment
0-10 min	Warm-up & Review	Begin with guided whole-group discussion asking students what they know about addition. Use counters to model a simple addition problem (e.g., 3 + 2), eliciting counting on from the first addend. Reference how many fingers are on a hand, reinforcing 5 and 10 as base numbers.	K.OA.A.1, K.OA.A.2
10-25 min	Counting On Strategy	Introduce "Counting On" with a hands-on activity: students start with 5 counters, then add 3 more by counting on from 5 aloud (6,7,8). Use individual mini number lines to visually reinforce movement from starting number.	K.OA.A.2, 1.OA.C.6
25-45 min	Making Ten Strategy	Introduce "Making Ten" by breaking apart numbers to reach 10. Example: 8 + 5; break 5 into 2 + 3, add 8 + 2 = 10, then add remaining 3. Use counters and diagram on whiteboard. Provide problem cards requiring this strategy. Students solve with adult guidance, explaining reasoning.	1.OA.C.5, 1.OA.C.6
45-65 min	Number Line Addition	Present a large number line; demonstrate adding 7 + 4 by hopping 4 steps from 7. Students practice with personal mini number lines. Then, students take turns solving addition problem cards using this method, explaining their steps aloud.	K.OA.A.1, 2.NBT.B.5
65-80 min	Problem-Solving Challenge (Collaboration)	Students work in pairs/trio to pick 3 addition problem cards, each solved with different strategies learned. Encourage discussion to decide most efficient method per problem. Provide strategy choice chart as a support tool. Teacher circulates to facilitate understanding and encourage justification.	K.OA.A.1, 1.OA.C.5, 2.NBT.B.5
80-90 min	Reflection & Assessment	Each student verbally explains one addition strategy they used today and why. Teacher records observations on their ability to justify strategy use and accuracy in problem solving. Administer a quick worksheet with 5 addition problems (mixed methods). Exit Ticket: Write or draw one addition strategy learned.	K.OA.A.1, 1.OA.C.6

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Differentiation

• For younger/less confident students (Kindergarten): Focus mostly on counting on and using counters. Keep numbers under 10.
• For early 1st graders: Include making ten concept with support, working numbers up to 15.
• For grades 2 or advanced 1st graders: Introduce number lines with numbers up to 20 and encourage fluency.

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Teacher Tips for WOW Factor

• Use engaging manipulatives: colorful counters, tactile number lines for kinesthetic learning.
• Promote mathematical talk by prompting “How did you solve this?” and “Can you think of another way?”
• Incorporate small movement breaks tied to number lines: hop along a taped number line on the floor to physically “jump” through addition steps.
• Personalize problem scenarios: link addition problems to their interests (e.g., “3 apples plus 5 apples”) to build relevance.

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Assessment Rubric

Criteria	3 - Mastery	2 - Progressing	1 - Emerging
Strategy Use	Uses 2 or more strategies correctly and explains reasoning confidently	Uses 1 strategy correctly with some explanation	Struggles to apply strategies or explain thinking
Accuracy	Solves problems with 90-100% accuracy	Solves problems with 70-89% accuracy	Solves less than 70% correctly
Participation & Communication	Actively participates and clearly communicates ideas	Participates but has limited explanation	Minimal participation or unclear explanation

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Reflection Questions for Teachers

• Which strategies did students grasp most quickly?
• How did peer collaboration impact understanding?
• What supports enhanced student confidence in addition?
• How can the number line strategy be reinforced in subsequent lessons?

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This detailed, standards-aligned lesson plan elevates foundational addition learning through multi-strategy exploration, hands-on activities, and meaningful peer interaction—providing teachers with clear steps to engage young mathematicians deeply.