Students use dot cards to see that numbers are in numbers.
If you look into 10 you will see 5 + 5 and 3 + 2 + 3 + 2. How are they related?
You might see 3 + 3 + 2 + 2 or you might see 6 + 4. How are they related?
Relating the facts, increases the likelihood of retrieval because things are linked. More important relating the facts allows students to build meaning and make sense. Number properties become more evident and transfer more readily to algebra.