THIRD GRADE • YEAR AT A GLANCE
i-Ready Classroom Mathematics
Open any unit to see its big ideas, family-friendly lesson overviews, major skills, and the grade-level standards connected to the work.
UNIT 1
September–OctoberThree-Digit Numbers: Place Value, Addition & Subtraction
Students strengthen place-value understanding and use it to estimate, add, and subtract within 1,000. They explain their strategies and check whether answers are reasonable.
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Lessons at a glance
- Lesson 1: Use Place Value to Round NumbersUse place value to decide which multiple of 10 or 100 a number is closest to.
- Lesson 2: Add Three-Digit NumbersCombine hundreds, tens, and ones accurately using place-value strategies.
- Lesson 3: Subtract Three-Digit NumbersSubtract within 1,000 and explain when regrouping is needed.
- Math in Action: Use Rounding and OperationsChoose operations, estimate, solve, and decide whether an answer makes sense.
Unit overview
Students strengthen place-value understanding and use it to estimate, add, and subtract within 1,000. They explain their strategies and check whether answers are reasonable.
Skills students practice
Rounding to the nearest 10 or 100; adding and subtracting three-digit numbers; estimating and checking solutions.
Standards represented
3.NBT.A.1, 3.NBT.A.2
UNIT 2
October–DecemberMultiplication & Division: Concepts, Relationships & Patterns
Students build the meaning of multiplication and division with equal groups, arrays, drawings, and equations. They connect the two operations and develop efficient fact strategies.
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Lessons at a glance
- Lesson 4: Understand the Meaning of MultiplicationRepresent equal groups with pictures, arrays, repeated addition, and equations.
- Lessons 5–7: Multiply with 0–10Use patterns and known facts to solve multiplication facts accurately and efficiently.
- Lesson 8: Use Order and Grouping to MultiplyUse multiplication properties to make difficult facts easier.
- Lesson 9: Use Place Value to MultiplyUse basic facts and place value to multiply one-digit numbers by multiples of 10.
- Lesson 10: Understand the Meaning of DivisionInterpret division as sharing equally or finding equal groups.
- Lessons 11–12: Connect Multiplication and DivisionUse related facts and inverse operations to find unknown products and quotients.
- Lesson 13: Understand PatternsIdentify and explain arithmetic patterns in multiplication and addition tables.
- Math in Action: Solve Multiplication and Division ProblemsRepresent a real situation, select an operation, solve, and explain the answer.
Unit overview
Students build the meaning of multiplication and division with equal groups, arrays, drawings, and equations. They connect the two operations and develop efficient fact strategies.
Skills students practice
Equal groups and arrays; multiplication facts; properties and patterns; division as sharing and grouping; fact families; multiplying by multiples of 10.
Standards represented
3.OA.A.1–3, 3.OA.A.6, 3.OA.B.5–6, 3.OA.C.7, 3.OA.D.9, 3.NBT.A.3
UNIT 3
January–FebruaryMultiplication: Area, Word Problems & Scaled Graphs
Students apply multiplication and division to area, one- and two-step situations, and scaled graphs. The focus shifts from learning operations to choosing and using them well.
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Lessons at a glance
- Lesson 14: Understand AreaMeasure the space inside a shape with equal-size square units.
- Lesson 15: Multiply to Find AreaConnect rows and columns in a rectangle to multiplication.
- Lesson 16: Add AreasBreak a complex figure into rectangles and add the partial areas.
- Lesson 17: Solve One-Step Word ProblemsChoose multiplication or division for an equal-groups, array, or measurement situation.
- Lesson 18: Solve Two-Step Word ProblemsUse two operations and check that both parts of a problem are answered.
- Lesson 19: Scaled GraphsRead and create graphs where one symbol or interval represents more than one item.
- Math in Action: Use the Four OperationsApply addition, subtraction, multiplication, and division to a meaningful problem.
Unit overview
Students apply multiplication and division to area, one- and two-step situations, and scaled graphs. The focus shifts from learning operations to choosing and using them well.
Skills students practice
Area as square units; multiplying side lengths; decomposing shapes; one- and two-step word problems; scaled picture and bar graphs.
Standards represented
3.MD.B.3, 3.MD.C.5–7, 3.OA.A.3, 3.OA.D.8
UNIT 4
February–AprilFractions: Equivalence, Comparison, Measurement & Data
Students understand fractions as numbers, locate them on number lines, build equivalent fractions, and compare fractions using models and reasoning.
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Lessons at a glance
- Lesson 20: Understand What a Fraction IsDescribe equal parts and explain the numerator and denominator.
- Lesson 21: Understand Fractions on a Number LinePartition a number line into equal lengths and locate fractions.
- Lessons 22–23: Understand and Find Equivalent FractionsUse models and number lines to recognize different names for the same amount.
- Lessons 24–25: Compare FractionsCompare fractions and justify comparisons with models and symbols.
- Lesson 26: Measure Length and Plot DataMeasure to fractional units and organize results on a line plot.
- Math in Action: Use FractionsApply fraction models, equivalence, and comparison to a real situation.
Unit overview
Students understand fractions as numbers, locate them on number lines, build equivalent fractions, and compare fractions using models and reasoning.
Skills students practice
Unit fractions; fractions on number lines; equivalent fractions; comparing fractions; using <, >, and =; measuring and displaying fractional data.
Standards represented
3.NF.A.1–3, 3.MD.B.4
UNIT 5
April–MayMeasurement: Time, Liquid Volume & Mass
Students use standard units and the four operations to solve practical measurement problems involving elapsed time, liquid volume, and mass.
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Lessons at a glance
- Lesson 27: TimeTell and write time to the nearest minute and solve elapsed-time problems.
- Lesson 28: Liquid VolumeEstimate, measure, and solve problems involving liters.
- Lesson 29: MassEstimate, measure, and solve problems involving grams and kilograms.
- Math in Action: Solve Measurement ProblemsSelect appropriate units and operations for a practical measurement situation.
Unit overview
Students use standard units and the four operations to solve practical measurement problems involving elapsed time, liquid volume, and mass.
Skills students practice
Telling time to the minute; finding elapsed time; estimating and measuring liquid volume and mass; solving measurement word problems.
Standards represented
3.MD.A.1, 3.MD.A.2
UNIT 6
May–JuneShapes: Attributes, Perimeter, Area & Partitioning
Students describe and classify two-dimensional shapes, connect area and perimeter, and partition shapes into equal parts that can be named as fractions.
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Lessons at a glance
- Lesson 30: Understand Categories of ShapesDescribe shapes by their sides, angles, and other shared attributes.
- Lesson 31: Classify QuadrilateralsIdentify and compare squares, rectangles, rhombuses, and other quadrilaterals.
- Lesson 32: Area and Perimeter of ShapesDistinguish the distance around a shape from the space inside it.
- Lesson 33: Partition Shapes into Equal AreasDivide shapes into equal parts and name each part as a fraction.
- Math in Action: Work with ShapesCombine geometry, measurement, and fraction reasoning in a real-world task.
Unit overview
Students describe and classify two-dimensional shapes, connect area and perimeter, and partition shapes into equal parts that can be named as fractions.
Skills students practice
Shape categories and attributes; classifying quadrilaterals; area and perimeter; equal-area partitions and fractional parts.
Standards represented
3.G.A.1–2, 3.MD.D.8