P1 · Number · NUM.ADD.WITHIN100
Add within 100
Add within 100
Intuition
Understand first, compress later.
Connect symbolic calculation to magnitude, estimation and a visual representation.
Switch representations
Base ten blocks243
hundred flatten rodunit cube
Formal view
You can add within 100 when you can recognise the underlying objects, select valid rules and check each step for equivalence or logical implication.
Why does it work?
This skill sits on a prerequisite network. If a step is unstable, repair the missing prerequisite instead of merely doing more items of the same type.