Math Lessons | Word Problems Sums and Differences within 20 for 8-Year-Olds

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• Preschool
• Kindergarten
• Grade 1
• Grade 2
• Grade 3

• Arts  
  • Coloring  
    • Drawing and Counting
    • Holidays and Culture
    • Reading Adventures
    • Our Earth and Beyond
• Chess  
  • GAME BASICS  
    • Chess Basics
    • Pieces - How They Move and Capture
    • Purpose of the Game
  • STRATEGIES  
    • Basic Tactics
    • Putting it All Together
• English Language Arts  
  • Early Literacy Skills  
    • Letters Are Made of Lines and Curves
    • Alphabet
    • Phonological Awareness
  • Vocabulary  
    • Common Vocabulary
    • Determine or Clarify the Meaning of Unknown Words
    • Pre-K Sight Words
    • Word Relationships and Nuances
  • Print Awareness  
    • Parts of a Book
    • Interacting with Different Kinds of Texts Part 1 (Picture Books and Poems)
    • Interacting with Different Symbols
  • Basic English Conventions  
    • Forming Sentences
    • Capitalization, Punctuation, and Spelling
  • Reading Informational Texts  
    • Answering Questions About Informational Texts Read Aloud (Content)
    • Key Ideas and Details/ Craft and Structure
    • Answering Questions About Informational Texts (Craft & Structure)
    • Integration of Knowledge and Ideas
    • Review Across Content
  • Foundational Reading Skills  
    • Letter ID
    • Phonological Awareness
    • Letter Sound Relationships
    • Phonics and Word Recognition
    • Spelling
    • High Frequency Words
  • Reading Literature  
    • Answering Questions About Stories Read Aloud (Content)
    • Key Ideas and Details/ Craft and Structure
    • Respond to Stories Read Aloud
    • Review Across Genres
    • Answering Questions About Stories Read Aloud (Craft & Structure)
    • Discuss Stories Read Aloud
    • Integration of Knowledge and Ideas
  • Reading Informational Text  
    • Key Ideas and Details/ Craft and Structure
    • Review Across Content
  • Conventions of Writing  
    • Grammar
    • Nouns and Pronouns
    • Other Parts of Speech
    • Sentences
    • Capitalization and Punctuation
• Foundational Reading  
  • Early Phonics and Phonological Awareness  
    • Letter Sound Relationships
    • Syllables and Rhyming
  • Print Concepts  
    • Print Concepts
    • Letter I.D
  • Phonological Awareness  
    • Vowel Sounds
    • Segmenting Words into Sounds
  • Phonics  
    • Digraphs
    • Long and Short Vowels
    • Prefixes and Suffixes
    • Long Vowel Patterns
    • Vowel Spelling Patterns
    • Spelling Patterns
    • Syllables
    • Inflectional Endings
  • Accuracy and Fluency  
    • Decoding Syllables
    • Decoding Words
    • Making Meaning
    • Fluency
  • Comprehension  
    • Literature
    • Informational Texts
    • Other Genres
• Logic and Early Math  
  • Early Logic and Geometry  
    • Matching and Sorting
    • Shapes
    • Data
  • Counting to 5  
    • 1,2, and 3
    • 4 and 5
    • Number Stories - 1 More
    • Number Stories - 1 Less
  • Counting to 10  
    • 6 & 7
    • 8 & 9
    • 0 & 10
  • Operations and Algebraic Thinking Within 5  
    • Addition Story Problems (#'s 1-5)
    • Subtraction Story Problems (#'s 1-5)
• Math  
  • Early Logic and Geometry  
    • Matching and Sorting
    • Shapes
    • Data
  • Counting and Cardinality up to 20  
    • Counting and Numbers
    • Counting to Tell How Many
    • One More and One Less
    • Fluency
  • Additional Practice with Numbers up to 20  
    • Addition and Subtraction
    • Addition and Subtraction Story Problems
    • Composing Numbers
  • Foundations in Operations Within 100  
    • Counting
    • Place Value
    • Addition and Subtraction - less than 20
    • Addition and Subtraction 20-100
  • Applications in Operations Within 100  
    • Word Problems Sums and Differences within 20
    • Thinking Deeper about Addition and Subtraction—The Unknown Number
    • Make it Easy Strategies
  • Foundations and Applications in Measuring, Time and Data  
    • How to Measure Using the World Around You
    • Measuring, Estimating & Time
    • Keeping Track of Data
    • Telling Time
    • Keeping Track of Information
  • Geometry  
    • 2D and 3D Shapes
    • Shapes and their Characteristics
    • Fractions and Shapes
    • Math in Shapes
  • Foundations in Operations Within 1000  
    • Place Value
    • Counting and Comparing
    • Addition and Subtraction within 100
    • Addition and Subtraction within 1,000
  • Applications in Operations Within 1000  
    • Word Problems Sums and Differences within 100
    • Thinking Deeper about Addition and Subtraction—The Unknown Number
    • Equal Groups
  • Foundations in Numbers and Fractions  
    • Rounding
    • Adding and Subtracting to 1,000
    • Making and Representing Fractions
  • Multiplication and Division  
    • Multiplication Facts
    • Division
    • Multiplication, Division and Other Word Problems
  • Data, Geometry, Area and Perimeter  
    • Graphing
    • Area and Perimeter
    • Geometry
• Science  
  • Sound and Light
  • Force and Interactions
  • Matter
  • Organisms
  • Space
  • Earth's Systems
  • Relationships in ecosystems
  • Weather
  • Changes
  • Earth and Human Activity
  • Plants
  • Animals
  • Engineering
• Social Studies  
  • Your Community  
    • Where You Live
    • Where You Go
    • Community Helpers
    • Rules & Safety
  • Citizenship  
    • Being a Citizen
    • Good Citizenship
  • Your World  
    • The World You Live In
    • Government and Civics
    • Economy
  • History  
    • History Around the World
    • World History
    • Historical Dates, Years, and Times
  • Who You Are  
    • Community Members
    • Members of Society
    • World Citizens
  • America  
    • American History
    • American Government
    • American Geography
  • The World Around You  
    • World Geography
    • Cultures Around the World
    • World History
    • Languages Around the World
    • World Culture and Language
    • Celebrations Around the World
    • Economic Systems
  • The Ancient World  
    • Ancient History
    • Past Life and Culture
• World around Us  
  • Me and My Family
  • My Home
  • My Body and Emotions
  • Community Helpers
  • Places I Go
  • Seasons and Weather
  • Animals
  • Plants
  • Things That I Eat
  • Things That I Wear
  • Outer Space