Khan Academy

Place value example: 25 (K-A)

Place value example: 42 (K-A)

Teen numbers: monkeys (K-A)

Teens as sums with 10 (K-A)

Adding 5 + 3 + 6 (K-A)

Adding 7 + 6 (K-A)

Adding 8 + 7 (K-A)

Equal sign (K-A)

Repeated addition: haircuts (K-A)

Subtracting 14 – 6 (K-A)

Comparison word problems: marbles (K-A)

Comparison word problems: roly-polies (K-A)

Addition and subtraction word problems: gorillas (K-A)

Addition and subtraction word problems: superheroes (K-A)

Adding 1 vs. adding 10 (K-A)

Understanding place value when adding ones (K-A)

Understanding place value when adding tens (K-A)

Missing numbers in addition and subtraction (K-A)

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

Adding with regrouping (K-A)

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

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

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

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

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