Kindergarten | We looked at the idea of making one out of ten - for example students putting toy bears in tens and building a structure (which they stea afterwards) using ten cubes. This is fundamental to counting to twenty.
In Grade 1, we see adding ones to ones, tend to tens, renaming and breaking numbers apart appropriately are key ideas in addition within 100. We also discussed conditions of learning.
The middle school studied two lessons - one on exponents and the other on measures on variation.