Khan Academy

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

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

Adding 8 + 7 (K-A)

Subtracting 14 – 6 (K-A)

Subtracting different ways (K-A)

Addition word problems within 10 (K-A)

Subtraction word problems within 10 (K-A)

Adding 3-digit numbers (K-A)

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

Adding 2-digit numbers without regrouping 2 (K-A)

Adding with regrouping (K-A)

Add and subtract: pieces of fruit (K-A)

Basic addition (K-A)

Basic subtraction (K-A)

Relating addition and subtraction (K-A)

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

Breaking apart 2-digit addition problems (K-A)

Example: Adding 2-digit numbers (no carrying) (K-A)

Regrouping to add 1-digit number (K-A)

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

Subtracting a 1-digit number with regrouping (K-A)

Adding to 10 (K-A)

Getting to 10 by filling boxes (K-A)

Adding and subtracting on number line (K-A)

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