A gap to fill
Explore number trains through models, conversation, and hands-on discovery. Find a missing part by comparing a rod with the desired total. Explore a model, explain the relationship, and try it with physical materials.
What children will practice.
Explore how to find a missing part by comparing a rod with the desired total.
Ideas to explore.
Connect a model with a physical or paper representation. Invite learners to show what they notice and explain a relationship; an adult can read the directions and record their words.
An investigation to explore
A train must be 9 units long. Its first rod is 4. Choose the missing rod and explain your choice.
An adult can read the prompt. Learners may arrange, draw, point, or explain. Full teaching directions and answer keys are in the free adult classroom.
From a model to a little discovery.
The complete lesson includes a teaching sequence, worked example, guided and independent investigations, a transfer task, student work mats, and a separate answer key. Choose US Letter or A4 PDFs.
Use Glow Math & Logic as an practice companion. The printable lesson also works away from a screen. Full teaching materials are included with a paid adult account.
Choose by readiness and prior teaching. Lesson drafts include proposed grade placement; starter guides are flexible workshop introductions.
Complete lesson drafts with proposed grade placement. Educators can share detailed feedback from the teaching guide.