A lesson focused on identifying the value of a variable that satisfies a one-step equation through substitution and mental math.

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.

Breaking apart teen numbers into 'ten' and 'some more' to prepare for equation work.

Connecting concrete counters to drawings and visual models for all teen numbers.

Using double 10-frames to quickly identify and build any teen number from 11-19.

Focus on the final teen numbers 18 and 19, emphasizing how close they are to two full 10-frames.