Khan Academy

Addition using groups of 10 and 100 (K-A)

Breaking apart 3-digit addition problems (K-A)

Intro to place value (K-A)

Missing number for 3-digit addition within 1000 (K-A)

Using place value to add 3-digit numbers: part 1 (K-A)

Subtracting 3-digit numbers (regrouping) (K-A)

Using place value to add 3-digit numbers: part 2 (K-A)

Subtracting in your head (no regrouping) (K-A)

Worked example: Subtracting 3-digit numbers (regrouping from 0) (K-A)

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

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

Unknowns with multiplication and division (K-A)

Associative property of multiplication review (K-A)

Intro to associative property of multiplication (K-A)

More ways to multiply (K-A)

Finding patterns in numbers (K-A)

Intro to even and odd numbers (K-A)

2-step estimation problem: marbles (K-A)

2-step word problem: running (K-A)

Identity property of 1 (K-A)

Patterns in multiplication tables (K-A)

Intro to area and unit squares (K-A)

Measuring rectangles with different unit squares (K-A)

Area of rectangles review (K-A)

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