Awesome Visuals for addition mastery.

Deck 1 (25 Cards) is based on dots in dice patterns, and goes from 1 + 1 to 5 + 5 It's all about the connections between counting, counting  on and addition.

Deck 2 ( 75 cards) has the rest of the facts up to 10 + 10 This one uses ten frames, which highlight the fundamental notion of making tens.

Deck 3 ( 32 Cards) dispenses with dots and uses bar diagrams. This has the dual purpose of removing all the scaffolding (kids need to know the facts by heart) and introducing students to a hugely useful visualisation.

Bonus Deck teen numbers reference guide. There's also an additional deck that includes the names and meanings of the teen numbers, as these irregularly named numbers are often a sticking point for Kindergarteners and others. 

The box is set up for spaced repetition to make the most of the time you spend practicing. (ideally 5 minutes a day)