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3rd Grade · Math · Open Global Math
Adding and Subtracting Fractions with Like Denominators
Track 1 of 7 · 7 lessons
7 lessons
Add and subtract fractions with identical denominators within one whole using visual models, numeric equations, and multi-step word problems.
Featured Diagrams
- 1Adding Fractions with the Same Denominator Using ModelsUp nextStart
- 2Subtracting Fractions with the Same Denominator Using ModelsPremiumNot started yet
- 3Adding Fractions with the Same Denominator SymbolicallyNot started yet
- 4Subtracting Fractions with the Same Denominator SymbolicallyNot started yet
- 5Breaking a Fraction into Smaller FractionsNot started yet
- 6Solving Fraction Addition and Subtraction Word ProblemsNot started yet
- 7Two-Step Fraction Word Problems with the Same DenominatorNot started yet
Algebraic Equations and Unknown Values
Track 2 of 7 · 6 lessons
6 lessons
Find unknown values represented by symbols, boxes, and letters in multi-term equations across all four operations.
Featured Diagrams
- 1Representing Unknown Values with Letters and SymbolsUp nextStart
- 2Finding Unknown Factors in Multiplication EquationsPremiumNot started yet
- 3Finding Unknown Dividends and DivisorsNot started yet
- 4Balancing Equations with Three or More NumbersNot started yet
- 5Solving Equations with Parentheses and OperationsNot started yet
- 6Writing Equations with Variables from DescriptionsNot started yet
Angles as Turns, Classification, and Protractor Measurement
Track 3 of 7 · 9 lessons
9 lessons
Understand angles as geometric turns, classify acute, right, obtuse, and straight angles, and measure and draw benchmark angles using protractors.
Featured Diagrams
- 1Exploring Angles as Turns: Whole, Half, and Quarter TurnsUp nextStart
- 2Understanding Angles as Geometric Openings in DegreesPremiumNot started yet
- 3Comparing Angles to a Right-Angle BenchmarkNot started yet
- 4Classifying Angles as Right, Straight, Acute, or ObtuseNot started yet
- 5Angle Properties on Straight LinesNot started yet
- 6Reading a Protractor: Inner and Outer ScalesNot started yet
- 7Using a Protractor to Measure Acute and Obtuse AnglesNot started yet
- 8Drawing Benchmark Angles with ProtractorsNot started yet
- 9Estimating Angle Measures in Everyday ObjectsNot started yet
Area, Unit Squares, and Rectangular Arrays
Track 4 of 7 · 6 lessons
6 lessons
Understand area as surface coverage using unit squares, relate rectangular area to multiplication, and apply the distributive property.
Featured Diagrams
- 1Understanding Area as Surface Covering Without GapsUp nextStart
- 2Measuring Area with Standard Square Units: cm², dm², m², in², and ft²PremiumNot started yet
- 3Finding Area by Tiling and Counting Unit SquaresNot started yet
- 4Relating Rectangular Area to Multiplication: Rows and ColumnsNot started yet
- 5Applying the Area Formula: Length Times WidthNot started yet
- 6Solving Area Problems by Breaking ApartNot started yet
Chance, Probability Language, and Experiments
Track 5 of 7 · 5 lessons
5 lessons
Describe likelihood of everyday events using qualitative chance terms, conduct repeated probability experiments, and record outcomes.
Featured Diagrams
- 1Using Chance Language: Certain, Likely, Unlikely, ImpossibleUp nextStart
- 2Identifying Equally Likely Outcomes in Everyday EventsPremiumNot started yet
- 3Ordering Events on a Qualitative Chance ScaleNot started yet
- 4Conducting Repeated Chance Experiments with Spinners and DiceNot started yet
- 5Analyzing Experimental Outcomes and Sample VariationNot started yet
Classifying and Comparing 2D Shapes: Triangles and Quadrilaterals
Track 6 of 7 · 8 lessons
8 lessons
Classify, describe, and compare triangles and quadrilaterals by side lengths, angle types, and parallel or perpendicular side properties.
Featured Diagrams
- 1Classifying Triangles by Angles: Acute, Right, ObtuseUp nextStart
- 2Classifying Triangles: Equilateral, Isosceles, and ScalenePremiumNot started yet
- 3Combining Triangle Attributes by Sides and AnglesNot started yet
- 4Sorting Squares, Rectangles, and RhombusesNot started yet
- 5Understanding Trapezoids and Non-Parallelogram QuadrilateralsNot started yet
- 6Quadrilateral Hierarchies: True or False StatementsNot started yet
- 7Drawing Polygons with Specified Side and Angle PropertiesNot started yet
- 8Comparing Regular and Irregular PolygonsNot started yet
Comparing and Ordering Fractions
Track 7 of 7 · 7 lessons
7 lessons
Compare fractions with common numerators, common denominators, or benchmark reasoning using relational symbols.
Featured Diagrams
- 1Comparing Unit Fractions up to Tenths of the Same WholeUp nextStart
- 2Comparing Fractions with the Same DenominatorsPremiumNot started yet
- 3Comparing Fractions with the Same NumeratorsNot started yet
- 4Comparing Fractions Using Half as a BenchmarkNot started yet
- 5Recording Fraction Comparisons with SymbolsNot started yet
- 6Ordering Three or More FractionsNot started yet
- 7Reasoning About Fraction Size in Story ProblemsNot started yet