Domino Alliance

4 videos explaining:

Understanding +,- and =;

Number Bonds;

Adding and subtracting numbers (within 20);

Solving missing number problems 

http://mathsathome.lgfl.org.uk/y1_addition.html

4 videos explaining:

Applying methods;

The commutative law;

Adding and subtracting numbers to 100;

Missing number problems

http://mathsathome.lgfl.org.uk/y2_addition.html