Keatyn’s Number Detective Mission: Identifying Numbers 10–20

Materials Needed

• Number cards labeled 10–20
• Small objects for counting, such as blocks, buttons, or cereal pieces
• Paper and crayons or pencil
• Optional: device for a short YouTube Kids video
• Optional video: Jack Hartmann: “Count to 20 and Workout” (Choose a short section and preview it first.)

Learning Objectives

By the end of this 10-minute lesson, Keatyn will be able to:

• Recognize and name the numbers 10–20.
• Match a written number to the correct number of objects.
• Identify a number when it is shown out of order.

Success Criteria

Keatyn is successful when she can correctly name at least 9 out of 11 numbers from 10–20 and match at least 3 numbers to the correct quantities.

Lesson Plan: 10 Minutes

1. Introduction and Hook — 1 Minute

Say: “Keatyn, today you are a number detective! Your mission is to find and name numbers from 10 to 20. Numbers can hide in games, prices, addresses, and calendars.”

Show the number 10 and ask:

• “What number is this?”
• “What number comes after 10?”

Tell Keatyn: “We will learn to spot numbers 10–20 quickly and match them with groups of objects.”

2. I Do: Teacher or Adult Modeling — 2 Minutes

Place the number cards 10–20 in order. Point to each card and say the number clearly.

Explain:

• “Numbers 10–19 have a 1 in the tens place.”
• “The number 20 has 2 tens.”
• “The second digit helps us tell which number it is: 10, 11, 12, 13, and so on.”

Model matching a card to objects. For example, hold up 14, count out 14 blocks, and say: “This card says 14, so I need a group of 14 objects.”

3. We Do: Practice Together — 3 Minutes

Mix up the number cards from 10–20. Ask Keatyn to choose one card at a time and name it.

Use these prompts as needed:

• “What number do you see?”
• “What number comes just before it?”
• “What number comes just after it?”
• “Can you show me that many objects?”

Play “Number Detective”:

1. Say a number, such as 17.
2. Keatyn finds the matching card.
3. She builds a group of 17 objects or points to 17 objects in a group.
4. Celebrate with: “Case solved!”

4. You Do: Independent Practice — 3 Minutes

Give Keatyn the mixed-up number cards. Ask her to complete these challenges:

1. Put the cards in order from 10 to 20.
2. Close her eyes while the adult removes one card.
3. Open her eyes and identify the missing number.
4. Choose three cards and draw or build that many objects.

For a written option, say three numbers from 10–20 and have Keatyn write each number.

Give specific feedback, such as: “You knew that 16 comes after 15. You used the number order to solve it!”

5. Quick Video or Movement Review — 1 Minute

Play about one minute of the selected counting video. Ask Keatyn to clap, march, or tap once for each number she hears from 10–20.

If a video is not available, count from 10 to 20 together while doing 11 movements, such as jumps, claps, or toe taps.

Assessment

Formative Checks

• Ask Keatyn to name numbers shown out of order.
• Ask which number comes before or after a given number.
• Observe whether she matches a number card to the correct quantity.

End-of-Lesson Check

Show Keatyn five random cards from 10–20. Ask her to name each one. Then ask her to:

• Find the number 12.
• Find the number 19.
• Tell which number comes after 16.
• Match one card to the correct number of objects.

Differentiation

• Extra support: Use only numbers 10–15 first, keep the cards in order, and count objects together slowly.
• Visual support: Write numbers in large print and use groups of ten plus extra objects, such as 1 group of 10 and 4 more for 14.
• Movement support: Let Keatyn jump or clap while saying each number.
• Challenge: Ask Keatyn to arrange numbers backward from 20 to 10 or solve clues such as, “I am greater than 14 but less than 16. What number am I?”
• Choice: Keatyn may practice with cards, blocks, a drawing, or a number-hunt around the house.

Closure — 1 Minute

Ask Keatyn:

• “What numbers did we practice today?”
• “Which number was easiest to recognize?”
• “Which number would you like to practice again?”

Finish by saying: “Today you identified numbers 10–20, put them in order, and matched numbers to groups of objects. You completed your number detective mission!”