Khan Academy

Worked example: Subtracting 3-digit numbers (regrouping twice) (K-A)

Worked example: Subtracting 3-digit numbers (regrouping) (K-A)

Missing number for addition and subtraction within 1000 (K-A)

Fractions on a number line (K-A)

Fractions on number line widget (K-A)

Equivalent fraction models (K-A)

Comparing fractions with > and < symbols (K-A)

Intro to area and unit squares (K-A)

Creating rectangles with a given area 1 (K-A)

Creating rectangles with a given area 2 (K-A)

Intro to area and unit squares-video (K-A)

Measuring area with partial unit squares (K-A)

Measuring rectangles with different unit squares (K-A)

Counting unit squares to find area formula (K-A)

Transitioning from unit squares to area formula (K-A)

Area of rectangles review (K-A)

Comparing areas of plots of land (K-A)

Counting unit squares to find area formula – video (K-A)

Finding missing side when given area (K-A)

Area and the distributive property-video (K-A)

Area word problem: house size (K-A)

Decomposing shapes to find area: add (K-A)

Decomposing shapes to find area: grids (K-A)

Decomposing shapes to find area: subtract (K-A)

Find perimeter by counting unit squares (K-A)