Students build on the 'ten and some more' concept specifically for 14 and 15, introducing the double 10-frame visual model.
Review of all teen number concepts and a final formative check-in.
Formalizing the relationship between teen numbers and equations of the form 10 + n.
Solving simple story problems involving teen numbers using the 'ten and some more' structure.
Using visual models to compare teen numbers and determine which is greater or less.
Introduction to unitizing: seeing 10 ones as 'one ten' using bundles and towers.
