Khan Academy

Reading and writing Roman numerals (K-A)

Roman numerals worked example (K-A)

Rounding to nearest 10 (K-A)

Rounding to nearest 10 and 100 (K-A)

Rounding to nearest 100 (K-A)

Rounding whole numbers to nearest hundred (K-A)

Rounding whole numbers to nearest ten (K-A)

Rounding whole numbers to nearest thousand (K-A)

Rounding whole numbers word problems (K-A)

Rounding whole numbers: missing digit (K-A)

Whole numbers in expanded form review (K-A)

Whole numbers in written form review (K-A)

Writing a number in expanded form (K-A)

Writing a number in standard form (K-A)

Adding 10 or 100 (K-A)

Adding 1s, 10s, and 100s-video (K-A)

Adding 3-digit numbers (no regrouping) (K-A)

Adding multi-digit numbers: 48,029+233,930 (K-A)

Alternate mental subtraction method (K-A)

Multi-digit addition with regrouping (K-A)

Multi-digit subtraction with regrouping twice (K-A)

Multi-digit subtraction with regrouping: 6798-3359 (K-A)

Multi-digit subtraction with regrouping: 7329-6278 (K-A)

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

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