Number Order Challenge

Overview

Students build fluency with numbers to 20 by ordering numerals, counting backwards, and identifying the number before and after a given number. The lesson uses movement, talk and visual representations to connect spoken number sequences with written numerals.

Learning intentions

• WALT count forwards and backwards within 20.
• WALT put numbers in order from smallest to largest.
• WALT say the number before and after a given number.
• WALT explain how I know which number comes next or belongs between two numbers.

Success criteria

• I can count backwards from 20 to 0.
• I can arrange numbers from smallest to largest.
• I can name the number before and after a number to 20.
• I can explain my thinking using a number line or counting pattern.

Curriculum links

• Mathematics and Statistics — Number: developing understanding of the sequence, order and relationships of whole numbers.
• Mathematics and Statistics — Number: using counting strategies forwards and backwards within 20.
• Mathsteasers: additional resources for advanced learners — offering purposeful challenge and higher-order thinking.
• Mathsteasers: alignment — connecting challenge questions with relevant mathematics learning.

Lesson structure (15 minutes)

1. 0–3 min · Hook and count. Teacher opens with the counting challenge slides and asks, “What happens to the numbers when we walk backwards?” Students stand beside their places and count forwards from 0 to 20, then slowly count backwards from 20 to 0 with the teacher, using fingers or actions to support the sequence.

2. 3–6 min · Order numbers. Teacher displays three mixed numerals, such as 7, 2 and 5, and models placing them from smallest to largest while thinking aloud: “I look for the number with the least.” Students use the Numbers Flashcards in groups of three or four to arrange a small selection of cards in order, then read the sequence aloud.

3. 6–10 min · Before and after. Teacher shows a numeral on the counting challenge slides and asks, “What number comes before? What number comes after?” Students respond together, then take turns selecting a card and telling a partner the number before and after it. Partners check by counting forwards or backwards from the selected number. Avoid using 0 as the target if students need a clear number before it.

4. 10–13 min · Independent check. Teacher distributes the number order and before-and-after worksheet and supports students to complete the short tasks: order three numerals, fill in a missing number in a counting sequence, and write the number before and after two target numbers. Students may point, whisper-count or use a number line while working.

5. 13–15 min · Share and exit check. Teacher revisits the counting challenge slides and asks each student to answer one quick question, such as “What comes before 14?” or “Put 9, 3 and 6 in order.” Students show an answer with fingers, a card or a spoken response, then complete the sentence: “I know because…”

Resources

• the counting challenge slides
• the number order and before-and-after worksheet
• the Numbers Flashcards
• Large floor or magnetic number line from 0 to 20
• Whiteboard and marker
• Pencils and crayons
• Optional counters for students who need concrete support

Assessment

• Listen for accurate counting backwards, particularly the transitions from 20 to 19, 11 to 10 and 10 to 9.
• During card ordering, check whether students compare quantities or rely only on memorised numeral order; ask, “How do you know?”
• Use the worksheet and final oral questions to identify students who confuse before and after or omit numbers in a sequence.

Differentiation

• Support: Keep a large 0–20 number line visible; begin with numbers 0–10 before moving to 20. Let students physically stand on or point to the number line and use counters to check their answer.
• Language and dyslexia-friendly access: Read every instruction aloud, use large clear numerals with generous spacing, minimise written text, and provide the sentence frames “Before __ is __” and “After __ is __.” Accept oral, pointing or card-based responses.
• EAL learners: Pair each target numeral with a consistent gesture and model the language repeatedly: “before,” “after,” “smallest,” “largest,” “in order.”
• Advanced learners: Ask students to find all possible numbers that can go between two given numbers, order four or five cards, or create a missing-number sequence for a partner to solve. Encourage explanations rather than speed alone.

Extension

• Challenge students to arrange cards from largest to smallest and count backwards along their arrangement.
• Ask: “I am thinking of a number between 8 and 12. What could it be? What numbers come before and after it?”