MathIsimple
Unit 2

Addition & Subtraction within 20

Learn addition and subtraction concepts, strategies, and problem-solving with numbers up to 20. Master the Make 10 strategy and build math fluency

4 Interactive LessonsAge-AppropriateStrategy-Based LearningFluency Building
Start First LessonBack to 1st Grade Math

Four Interactive Lessons

Each lesson builds essential skills for addition and subtraction mastery

Lesson 2-1: Addition & Subtraction Concepts

20-25 minutes

Operation Adventure launches with four interactive stations that connect stories, visuals, and real-world problem solving to deepen operation sense.

Skills You'll Learn:

Addition concepts
Subtraction concepts
Visual models
Math vocabulary

Interactive Features:

Four themed stations highlight visual addition, narrative subtraction, concept matching, and real-life challenges
Station guides include bilingual prompts plus classroom, home, and extension ideas
Printable activity cards list materials, goals, and assessment tips for quick use

Lesson 2-2: Addition & Subtraction within 10

25-30 minutes

Fact Fluency Playground breaks down each practice station with highlights, teaching moves, and progress tools to build mastery within 0-10.

Skills You'll Learn:

Fact fluency
Number bonds
Speed practice
Self monitoring

Interactive Features:

Detailed walkthroughs of the Fact Practice, Number Bond, Speed Challenge, and Fluency Quiz stations
Each station includes classroom, home, and extension plans with ready-to-use material lists
Hero CTA scrolls directly to the interactive lab so navigation stays smooth

Lesson 2-3: Addition Strategies - Make 10

30-35 minutes

Make 10 Lab delivers step-by-step strategy modeling, mental math tracking, and misconception alerts to strengthen strategy transfer.

Skills You'll Learn:

Make 10
Strategy explanation
Mental math
Error analysis

Interactive Features:

Four stations provide sentence frames, enrichment tasks, and family collaboration suggestions
Interactive lab buttons align with anchors to keep teachers and learners in sync
Practice hub adds materials, objectives, and assessment cues for every routine

Lesson 2-4: Subtraction Strategies

30-40 minutes

Subtraction Strategy Lab opens with counting back, fact family links, visual models, and scenario quests so students compare strategies in context.

Skills You'll Learn:

Counting back
Related facts
Visual subtraction
Strategy selection

Interactive Features:

SubtractionStrategyLab component spotlights four strategy stations right at the top
Each station outlines highlights, activity ideas, materials, and assessment steps
Practice section reinforces strategy selection and reflection throughout the lesson

Practice Worksheets

Reinforce your learning with printable and interactive worksheets. Available in both basic and advanced levels!

Basic Level

Foundation Practice

Master fundamental addition and subtraction within 20 with 20 practice problems covering key concepts and strategies.

  • Multiple choice & fill-in-blank questions
  • Instant feedback & explanations
  • Printable PDF available
Start Worksheet
Advanced Level

Challenge Problems

Extend your thinking with 15 challenging problems requiring strategic thinking, multi-step reasoning, and real-world applications.

  • Word problems & critical thinking
  • Detailed solution explanations
  • Printable PDF available
Start Worksheet

Strategy Progression Map

See how students move from conceptual understanding to fluent, flexible problem solving across the unit.

Milestone 1

Conceptual Foundations

Explore what addition and subtraction mean using stories, pictures, and manipulatives.

Learners talk about combining and separating groups before working with symbols.
Milestone 2

Fact Fluency Within 10

Build automatic recall of core facts with number bonds, games, and mental math routines.

Students focus on accuracy first, then increase speed.
Milestone 3

Strategic Thinking

Use the Make 10 strategy and doubles/near doubles to tackle harder facts.

Learners break numbers apart to make tens and explain their reasoning.
Milestone 4

Flexible Subtraction

Apply strategies like counting back, using inverse operations, and decomposition.

Students choose a strategy that fits the problem and justify their choice.

What You'll Master in This Unit

By the end of this unit, you'll have strong addition and subtraction skills

Understand Operations

Understand what addition and subtraction mean

Master Facts within 10

Build fluency with basic addition and subtraction facts

Use Make 10 Strategy

Master the powerful Make 10 strategy for addition

Apply Subtraction Strategies

Use multiple strategies to solve subtraction problems

Quick Win Activities

Incorporate these bite-sized routines between lessons to reinforce strategies and celebrate small victories.

Story Problem Warm-Ups

5 minutes

Act out mini stories with counters to connect operations to real life.

Strategy Spotlight

8 minutes

Highlight a student explanation using sentence frames and anchor charts.

Mini Fluency Sprint

6 minutes

Mix digital and printable fact cards to keep practice varied and joyful.

Teacher & Family Toolkit

Extend learning beyond the unit with targeted support ideas, formative assessments, and home extensions.

Differentiation

  • Provide ten frames, rekenreks, or bead strings for students needing concrete support.
  • Offer challenge cards with unknown partner problems for advanced learners.
  • Use color-coded sentence stems to scaffold mathematical explanations.

Formative Checks

  • Use quick exit slips with one addition and one subtraction equation.
  • Have students show strategies on mini whiteboards for instant feedback.
  • Track progress in the fluency dashboard to celebrate steady gains.

Family Extensions

  • Play grocery math—add two prices and compare totals during errands.
  • Create bedtime math stories featuring familiar characters and numbers.
  • Practice ‘Make 10’ with a deck of cards or dominoes at home.