Lesson Overview

Subject: Mathematics (Number Sense & Operations)

Grade Level: 3rd Grade (Age 9)

Duration: 30 Minutes

Focus: Understanding place value through choral counting, skip counting patterns, and the role of zero as a placeholder in multiplication.

Materials Needed

• Large Chart Paper or Whiteboard
• Markers (at least two different colors)
• Individual Number Lines (0-100)
• Base-Ten Blocks (Tens rods and ones cubes)
• "Pattern Detective" Exit Tickets

Learning Objectives

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

• Identify and describe horizontal and vertical patterns in a choral counting sequence.
• Explain the role of zero as a placeholder when counting by tens.
• Connect skip counting sequences to multiplication notation (e.g., 3 groups of 10 = 30).

Success Criteria

• I can find a pattern in a column of numbers.
• I can explain why the digit in the tens place changes when I count by tens.
• I can write a multiplication sentence that matches a skip counting pattern.

1. Introduction: Count Around the Circle (5 Minutes)

The Hook: "Today, we are number detectives. We are going to see if we can predict the future using only our brains and the power of patterns!"

The Routine: We will 'Count Around the Circle' by 10s.

• I Do: "I’ll start at 0. The person to my right will say the next number if we count by 10s."
• We Do: Begin the count (0, 10, 20, 30...). Stop at 50.
• Think-Pair-Share: "If we have 12 people in our circle, what number will the last person say? Don't count yet! Look at the pattern of the tens digit."
• Objective Connection: Point out that as we count, the "ones" place stayed the same (zero), but the "tens" place grew.

2. Body: Choral Counting & Pattern Recording (12 Minutes)

The Routine: Choral Counting (Inspired by Jessica Shumway’s Number Sense Routines).

Step-by-Step Guidance:

• Recording the Count: On a large chart, record the students counting aloud by 10s, but arrange them in rows of 5:

          10,  20,  30,  40,  50
          60,  70,  80,  90,  100
          110, 120, 130, 140, 150
          

• Pattern Spotting (Horizontal): "Look across the first row. What do you notice?" (Expected answer: The tens digit goes up by 1 each time.)
• Pattern Spotting (Vertical): "Look down the columns. What stayed the same? What changed?" (Expected answer: The ones place is always 0. In the columns, the tens digit jumps by 5.)
• Modeling Place Value: Use Base-Ten blocks to show 30 vs. 130. "Why is that zero still at the end? What happens if we take it away?" (Discussion: Without the zero, 30 becomes 3. The zero 'holds the door open' for the tens place.)

3. Application: Connecting to Multiplication (8 Minutes)

The Activity: Transition from skip counting to multiplication notation.

• I Do: "When we counted to 30 by tens, we said three numbers. That’s 3 groups of 10. In math talk, we write that as 3 x 10 = 30."
• We Do: "Look at the number 70 on our chart. How many 'counts' did it take to get there? Let's write the multiplication sentence together." (7 x 10 = 70).
• You Do (Partner Work): On individual number lines, students must jump by 10s to reach 100. For every jump, they write the corresponding multiplication fact (1x10, 2x10, etc.) below the number line.
• Challenge Question: "If multiplication is just fast adding or skip counting, why does 10 x 4 have a zero at the end? Does the 4 just get a zero, or did it move to a new 'house' (place value)?"

4. Conclusion: Recap & Assessment (5 Minutes)

Recap: "Today we saw that numbers aren't random. They follow tracks like a train!"

• Review: What is the job of the zero in the number 120? (Success criteria check: Placeholder).
• Summative Assessment (Exit Ticket): Students receive a slip of paper with the number 80. They must:
  1. Draw 80 using Base-Ten shorthand (8 lines for tens).
  2. Write the multiplication sentence (8 x 10 = 80).
  3. Explain in one sentence why there is a 0 in the ones place.

Differentiation & Adaptations

• Scaffolding (Struggling Learners): Provide a hundreds chart where they can physically color in the jumps of 10. Use physical Base-Ten blocks for every step of the choral count.
• Extension (Advanced Learners): Ask students to predict the patterns if we counted by 20s. How would the vertical column pattern change? Can they write a multiplication sentence for 12 x 10?
• Home/Classroom Adaptation: This can be done with coins (dimes) to make it kinesthetic and relate to real-world money.