Lesson Overview

Target Age: 6 Years Old (Kindergarten/1st Grade)

Duration: 10–15 Minutes

Topic: Introduction to Place Value (Base Ten Blocks) with a Monster Theme

Materials Needed

• Base Ten Blocks (at least 2 "rods/tens" and 20 "units/ones")
• A piece of paper with a large monster face drawn on it (the "Monster Mat")
• Number cards or slips of paper with numbers 11–19 written on them
• A small container or "Monster Bowl"

Learning Objectives

By the end of this lesson, the learner will be able to:

• Identify a "ten rod" as a group of 10 "ones."
• Compose numbers 11–19 using one ten and a given number of ones.
• Explain that the "1" in a teen number represents one group of ten.

1. Introduction: The Hungry Monster (2 Minutes)

The Hook: "Meet Barnaby the Block-Monster! Barnaby is very picky. He loves to eat 'Crunchy Ones' and 'Chewy Tens.' But he has a secret: if he eats 10 Crunchy Ones at the same time, they stick together in his tummy and turn into one long Chewy Ten rod!"

The Goal: "Today, we are the Monster Chefs. We have to prepare special 'Teen Number' snacks for Barnaby by using our tens and ones blocks."

2. Body: I Do, We Do, You Do (10 Minutes)

Step 1: I Do (The Magic Transformation)

Show the learner 10 individual "ones" cubes. Count them aloud together. Then, line them up next to a "ten rod."

Teacher Talk: "Look! Barnaby gulped down 10 little ones. Snap! They turned into one ten rod. Now, when we see a number like 13, I know that '1' at the front means one big Chewy Ten snack. I'll put one rod and three little cubes on Barnaby’s plate. That's 10... 11, 12, 13!"

Step 2: We Do (Kitchen Assistants)

Pick a number card (e.g., 15). Ask the learner to help you prepare the meal on the Monster Mat.

Interactive Prompt: "Barnaby wants 15 snacks. How many big Chewy Tens do we need? (Point to the '1' in 15). Right, just one! Let's put it on his tongue. Now, how many Crunchy Ones go next to it?"

Guide the learner to count out 5 units and place them on the mat. Count the total together: "Ten... and five more makes fifteen!"

Step 3: You Do (Head Chef)

Give the learner a new number card (e.g., 17 or 12). Let them build the number on the Monster Mat independently.

Instructions: "Chef, Barnaby is starving! Can you make him a plate of [Number]? Show me the Tens snack and the Ones snacks."

3. Conclusion: The Burp & Recap (2 Minutes)

Summary: Ask the student to pretend the monster let out a giant "BURP!" and all the blocks fell off the mat.

Recap Questions:

• "How many little ones have to stick together to make a big ten rod?" (10)
• "In the number 14, what does that '1' stand for? A single cube or a big ten rod?" (A ten rod)

Success Criteria: The learner successfully builds at least two teen numbers using one rod and the correct number of units.

Differentiation & Adaptations

• Scaffolding (Struggling): If the learner struggles to count on from 10, have them place the "ones" cubes directly on top of a ten-rod to see how they fit before moving them to the "ones" side.
• Extension (Advanced): Introduce the number 20. Ask the learner: "Barnaby wants 20! If we have 10 ones and another 10 ones, how many Chewy Ten rods can we give him?"
• Multi-Sensory: Use real snacks like pretzel rods (tens) and blueberries (ones) to make the lesson edible.

Assessment

Formative: Observe if the student automatically reaches for a "ten rod" when they see a teen number, or if they try to count out 14 individual cubes first. If they use the rod, they are grasping the concept of unitizing.

Summative: Ask the student to "write" a number using only blocks. For example: "Show me 16." If they place 1 rod and 6 units, they have met the objective.