Khan Academy

Relate place value to standard algorithm for multi-digit addition (K-A)

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

Multi-digit subtraction: 389,002-76,151 (K-A)

Relate place value to standard algorithm for multi-digit subtraction (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)

Adding 53+17 by making a group of 10 (K-A)

Adding by making a group of 10 (K-A)

Addition and subtraction with number lines (K-A)

Strategies for adding 2-digit numbers (K-A)

Subtracting 2-digit numbers without regrouping 1 (K-A)

Subtracting with regrouping (borrowing) (K-A)

Addition word problem: horses (K-A)

Subtraction word problem: crayons (K-A)

Subtraction word problem: snow (K-A)

Subtraction word problem: tennis balls (K-A)

Intro to division (K-A)

The idea of division (K-A)

Division using place value (K-A)

Division with area models (K-A)

Intro to long division (no remainders) (K-A)

Introduction to dividing by 2-digits (K-A)

Long division: 280÷5 (K-A)