Khan Academy

Finding measures using rigid transformations (K-A)

Mapping shapes (K-A)

Rigid transformations: preserved properties (K-A)

Determining rotations (K-A)

Rotating shapes (K-A)

Finding a quadrilateral from its symmetries (example 2) (K-A)

Finding a quadrilateral from its symmetries (K-A)

Intro to reflective symmetry (K-A)

Intro to rotational symmetry (K-A)

Determining translations (K-A)

Translating shapes (K-A)

Translation challenge problem (K-A)

Adding within 20 using place value blocks (K-A)

Adding within 20 using ten frames (K-A)

Subtract within 20 using a number line (K-A)

Subtract within 20 using place value blocks (K-A)

Adding with arrays (K-A)

Repeated addition: haircuts (K-A)

Using arrays in word problems (K-A)

Adding 5 + 3 + 6 (K-A)

Adding 7 + 6 (K-A)

Adding 8 + 7 (K-A)

Adding within 20 using place value blocks (K-A)

Adding within 20 using ten frames (K-A)

Equal sign (K-A)