Numbers to 20Activities & Teaching Strategies
Active learning helps students grasp the structure of teen numbers by engaging with concrete materials, which makes abstract concepts visible and tangible. Movement and hands-on activities build both number sense and confidence in counting, reading, and comparing numbers up to 20.
Learning Objectives
- 1Identify the quantity of tens and ones in numbers 11 through 20.
- 2Read and write numerals and number words for quantities from eleven to twenty.
- 3Compare two numbers between 11 and 20 using greater than, less than, or equal to.
- 4Represent numbers 11 through 20 using concrete manipulatives like ten-frames and counters.
- 5Explain how a ten-frame helps visualize the structure of numbers 11 through 20.
Want a complete lesson plan with these objectives? Generate a Mission →
Ten-Frame Build: Making Teens
Provide ten-frames, counters, and numeral cards 11-20. Students fill the frame with 10 counters first, then add ones to make numbers like 13. They write the number and read it aloud to a partner. Switch roles after five numbers.
Prepare & details
How are numbers 11 to 20 made up of a ten and some ones?
Facilitation Tip: During Ten-Frame Build, circulate and ask each pair to explain how they know their teen number is made of a ten and some ones.
Setup: Tables with large paper, or wall space
Materials: Concept cards or sticky notes, Large paper, Markers, Example concept map
Number Line Hop: Comparing Numbers
Mark a floor number line from 10 to 20 with tape. Call out two numbers, like 14 and 17; pairs hop to them and decide which is greater, using gestures to show more or less. Record comparisons on mini-whiteboards.
Prepare & details
How do we read and write numbers from eleven to twenty?
Facilitation Tip: During Number Line Hop, position yourself at the center to observe students' placement and encourage verbal comparisons like '15 is closer to 10 than 20'.
Setup: Tables with large paper, or wall space
Materials: Concept cards or sticky notes, Large paper, Markers, Example concept map
Straw Bundles: Grouping Tens
Give students straws or sticks and rubber bands. Direct them to make bundles of ten for numbers 11-20, then compare bundles side by side. Discuss how 15 has one full ten and five ones.
Prepare & details
How can we compare numbers greater than 10?
Facilitation Tip: During Straw Bundles, model bundling with slow, deliberate motions so students mimic the precision needed for accurate grouping.
Setup: Tables with large paper, or wall space
Materials: Concept cards or sticky notes, Large paper, Markers, Example concept map
Teen Number Hunt: Classroom Scavenger
Hide cards with teen numbers and objects around the room. In small groups, students find matches, count the objects to verify, and line up cards in order from 11 to 20 on the board.
Prepare & details
How are numbers 11 to 20 made up of a ten and some ones?
Facilitation Tip: During Teen Number Hunt, provide clipboards with mini ten-frames for students to record each found number in both numeral and word form.
Setup: Tables with large paper, or wall space
Materials: Concept cards or sticky notes, Large paper, Markers, Example concept map
Teaching This Topic
Start with concrete materials like ten-frames and straws to build the concept of a ten as a unit. Move to representational tools like number lines and numeral cards only after students demonstrate understanding through manipulation. Avoid rushing to symbols; let students verbalize the structure first. Research shows that delaying symbolic notation until conceptual understanding is secure reduces reversal errors and strengthens place value foundations.
What to Expect
Students will confidently compose numbers 11 to 20 as a ten and some ones, accurately read and write numerals and number words, and compare quantities using comparison terms. They will explain their reasoning using ten-frames, number lines, or bundled items.
These activities are a starting point. A full mission is the experience.
- Complete facilitation script with teacher dialogue
- Printable student materials, ready for class
- Differentiation strategies for every learner
Watch Out for These Misconceptions
Common MisconceptionDuring Ten-Frame Build, watch for students who fill ten-frames one counter at a time without recognizing the completed ten as a unit.
What to Teach Instead
Prompt students to fill the ten-frame completely before adding extras, and ask, 'How many counters are in the full ten-frame? How many extras are there?' to reinforce the structure.
Common MisconceptionDuring Teen Number Hunt, watch for students who reverse the digits when reading or writing teen numbers.
What to Teach Instead
Have students pair each found numeral with its ten-frame model and word card during the hunt, saying the number aloud while touching each component.
Common MisconceptionDuring Number Line Hop, watch for students who count all objects from 0 to compare numbers instead of using the number line as a visual tool.
What to Teach Instead
Remind students to start at the smaller number and count forward to the larger one, using the ten-frames to confirm the difference in quantities.
Assessment Ideas
After Ten-Frame Build, show students an image of a ten-frame with 10 counters and 4 extras. Ask them to write the total number and the number word on a whiteboard, then explain their answer using the ten-frame.
During Number Line Hop, give each student two numeral cards (e.g., 14 and 18) and ask them to place the cards on a number line, circle the larger number, and write a sentence using 'more than' or 'less than'.
After Straw Bundles, show two bundled groups (e.g., one bundle of 10 with 3 extras and another with 10 with 7 extras). Ask students to explain which group represents a larger number and how the bundles help them see the difference.
Extensions & Scaffolding
- Challenge students to create a number line from 10 to 20 using only ten-frame cards, then ask them to explain the pattern of tens and ones in their line.
- Scaffolding: Provide pre-bundled groups of ten for students to attach to additional singles when building teen numbers with straws.
- Deeper exploration: Introduce a game where students roll a die to add to a base of 10, recording each step on a ten-frame mat until they reach 20.
Key Vocabulary
| Ten-frame | A grid with two rows of five boxes, used to visually represent numbers up to ten, and by extension, teen numbers as a full ten-frame plus additional ones. |
| Ones | Individual units that make up a number. In numbers 11-20, these are the units beyond the full group of ten. |
| Tens | A group of ten ones. In numbers 11-20, there is always one group of ten. |
| Greater than | Used to compare two numbers when the first number is larger than the second number. |
| Less than | Used to compare two numbers when the first number is smaller than the second number. |
Suggested Methodologies
Planning templates for Mathematics
5E Model
The 5E Model structures lessons through five phases (Engage, Explore, Explain, Elaborate, and Evaluate), guiding students from curiosity to deep understanding through inquiry-based learning.
Unit PlannerMath Unit
Plan a multi-week math unit with conceptual coherence: from building number sense and procedural fluency to applying skills in context and developing mathematical reasoning across a connected sequence of lessons.
RubricMath Rubric
Build a math rubric that assesses problem-solving, mathematical reasoning, and communication alongside procedural accuracy, giving students feedback on how they think, not just whether they got the right answer.
More in Numbers and Operations
Counting to 10
Students will count objects up to 10 using one-to-one correspondence, recognise numerals 0–10, and match quantities to numerals.
2 methodologies
Numbers to 10: Reading and Writing
Students will read and write numerals and number words for 0 to 10 and understand the meaning of zero.
2 methodologies
Comparing and Ordering Numbers to 10
Students will compare two numbers using the language "greater than", "less than", and "equal to", and arrange numbers in order.
2 methodologies
Number Bonds to 10
Students will explore number bonds, understanding how two parts combine to make a whole within 10.
2 methodologies
Addition within 10
Students will add two single-digit numbers with a sum up to 10, using concrete objects, pictures, and number sentences.
2 methodologies