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▾
3rd grade
▸
Addition, subtraction, estimation
•
Mentally add within 1000
•
Round to the nearest 10 or 100
•
Add and subtract within 1000, abstract
▸
Multiplication
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Multiplication using rectangular arrays and equal groups, concrete and visual
•
Multiplication as repeated addition
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Multiply, abstract
▸
Division
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Divide using equal groups
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Division as repeated subtraction
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Divide, abstract
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Fractions
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Equal shares of shapes and unit fractions
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Plot fractions on the number line
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Relating fractions to 1
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Representing whole numbers as fractions
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Comparing fractions with like numerators, denominators, or both
▸
Relating multiplication and division
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Missing number problems, multiplication and division
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Relating multiplication to division
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Use properties to multiply and divide
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Multiply one-digit numbers by multiples of 10
▸
Arithmetic patterns and problem solving
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Two-step word problems
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Arithmetic and geometric sequences
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Patterns in addition and multiplication
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Intro to the triangular numbers
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Intro to the Fibonacci sequence
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Intro to Pascal's triangle
▾
Geometry
•
Shape heirarchy
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Area of composite rectangles by counting unit squares
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Area and units of measure
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Area as multiplication
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Area, perimeter, and how they're related
▸
Time, measurement, and data
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Tell and write time, minute increments
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Measure and estimate volumes and masses
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Scaled bar and picture graphs
•
Line plots with fractions
›
3rd grade
›
Geometry
›
Area of composite rectangles by counting unit squares
Other resources
Lesson
Khan Academy videos
369
Counting unit squares to find area formula
Khan Academy
~
YouTube
412
Intro to area and unit squares
Khan Academy
~
YouTube
YouTube videos
744
Finding the Area of a Rectangle (Montessori Geometry Demonstration)
Educational Video Publishing
5722
Learn how to calculate the area of a square and rectangle. Math lesson for kids
KidsMathTV
9686
Ex: Determine the Area of a Rectangle Involving Whole Numbers
Mathispower4u
72517
2nd Grade Math 11.7, Partition Rectangles with Square Tiles
JoAnn's School
Practice
Khan Academy exercises
Find area by counting unit squares
Khan Academy
Compare area with unit squares
Khan Academy
Additional resources
YouTube videos
5227
Identifying Area of a Rectangle by Counting Unit Squares: 3.MD.5a
TenMarks Amazon