There are 2 types of thinking in maths. Structural Thinking and Relational Thinking. Structural thinking looks at the structure of the number- what it is made up of (eg. How many tens, hundreds, ones etc). Relational thinking looks at the relationships a number has with other numbers. (eg. how many more to get to a tidy number, is it odd or even etc). ALL math strategies are made up of these 2 types of thinking.
We particularly looked at structural thinking and its place value.