Grade 3 math
Lessons commonly taught in grade 3, each with worked examples, practice problems, and complete solutions. Topics often span more than one grade, so you may see a lesson listed under a neighbouring grade too.
5 lessons · 13 standards
fractions
- Comparing Fractions: Which One Is Bigger?
Four ways to compare fractions: same bottom number, same top number, a common denominator, and cross multiplying. With bar models and worked examples.
- Equivalent Fractions: Same Amount, Different Numbers
What equivalent fractions are, how to find them by multiplying or dividing top and bottom by the same number, and how to check two fractions are equal.
- Fractions on a Number Line: Plotting and Reading Them
How to place a fraction on a number line by splitting each whole into equal parts, how to read one off, and why the number line makes fractions easier to order.
Geometry
- Area of a Rectangle: Length Times Width
Why the area of a rectangle is length times width, how to find a missing side, why area uses square units, and how to handle L-shaped figures.
- Perimeter: The Distance Around a Shape
What perimeter means, how to find it for any shape by adding the sides, the rectangle shortcut, and how to work backwards from a known perimeter.
Standards covered
- CCSS.MATH.CONTENT.3.MD.C.7
- CCSS.MATH.CONTENT.3.MD.C.7a
- CCSS.MATH.CONTENT.3.MD.C.7d
- CCSS.MATH.CONTENT.3.MD.D.8
- CCSS.MATH.CONTENT.3.NF.A.2
- CCSS.MATH.CONTENT.3.NF.A.2a
- CCSS.MATH.CONTENT.3.NF.A.2b
- CCSS.MATH.CONTENT.3.NF.A.3a
- CCSS.MATH.CONTENT.3.NF.A.3b
- CCSS.MATH.CONTENT.3.NF.A.3d
- CCSS.MATH.CONTENT.4.MD.A.3
- CCSS.MATH.CONTENT.4.NF.A.1
- CCSS.MATH.CONTENT.4.NF.A.2