Math Magic Start

Overview

Unit: Math Magic: Patterns & More
Lesson 1: Introduction to One More and One Less
Duration: 30 minutes
Class size: 3 students
Year group: Year 3 (ages 7-8)
National Curriculum Strand: Number - Number and Place Value

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National Curriculum Links

Key Stage 2 - Mathematics: Number and Place Value

Pupils should be taught to:

• Count from 0 in multiples of 4, 8, 50 and 100; find 10 or 100 more or less than a given number (Year 3 Programme of Study, Number and Place Value)
• Recognise the place value of each digit in a three-digit number (hundreds, tens, ones) (Y3 Number and Place Value)
• Identify, represent and estimate numbers using different representations, including number lines (Y3 Number and Place Value)
• Use place value and number facts to solve problems (Y3 Number and Place Value)

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Learning Objectives

By the end of the lesson, pupils will be able to:

• Understand the concept of "one more" and "one less" in relation to a given number up to 100.
• Count forwards and backwards in ones from any number within 100.
• Use physical objects to represent and demonstrate one more and one less.
• Verbally state a number that is one more or one less than a given number.
• Begin to record their answers using numbers and simple number sentences (e.g., 23 + 1 = 24).

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Resources

• Counters, cubes or small objects (e.g., Lego bricks, beads) – at least 30 per student
• Number cards from 0 to 100
• Whiteboards and markers or exercise books and pencils
• Number line strip (0 to 100) displayed in the classroom or individual smaller versions
• Visual number track or chart for quick reference

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Lesson Structure

1. Engage & Recall (5 minutes)

• Warm-up Counting Game: Each student takes turns counting aloud from 1 to 20 — then backwards from 20 to 1.
• Teacher models counting one more and one less starting from a random number (e.g., "If I start at 14, what is one more? One less?")
• Group discussion: Why is it important to know what comes before or after a number? (e.g., helps with addition/subtraction, patterns)

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2. Explore (10 minutes)

• Each student gets a set of counters on their desk. The teacher calls out numbers between 1 to 30, asking students to place that many counters in a pile.
• Then teacher asks:
  "Now, can you show me one more than that number?" (Add one counter)
  "Can you show me one less than that number?" (Remove one counter)
• Students record the number sentences on whiteboards or notebooks (e.g., 15 + 1 = 16, 15 - 1 = 14).
• Use number cards for students to physically select and place "one more" or "one less" cards next to the original number card.
• Teacher checks understanding by asking targeted questions, such as:
  -"If I have 22 counters, what is one less?"
  -"If I add one more counter, how many do I have now?"

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3. Explain & Model Understanding (8 minutes)

• Using the number line displayed, teacher points at a number and models moving one step forward (one more) and one step backward (one less).
• Link this back to the physical counters to consolidate the connection between abstract numbers and concrete objects.
• Highlight language: "one more than," "one less than," "one step forward," "one step back."
• Invite students one by one to come to the number line and show one more and one less of different numbers.
• Correct gently where needed and encourage peer support for explanations.

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4. Apply & Assess (5 minutes)

• Quick-fire round: Teacher says a number aloud, students respond with “one more” and “one less” answers.
• Each student writes down three number sentences for "one more" and three for "one less" (e.g., 17 + 1 = 18, 42 - 1 = 41).
• Teacher circulates, assesses understanding through observing, questioning, and written work.
• Positive reinforcement for accurate responses and correcting misconceptions immediately.

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5. Plenary & Reflect (2 minutes)

• Recap learning objectives and ask students to explain what “one more” and “one less” means in their own words.
• Each student shares one number example to demonstrate understanding.
• Teacher praises efforts and briefly previews next lesson: "Next time, we will explore patterns with these numbers!"

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Differentiation

• Support: Provide extra one-to-one support using counters for students struggling with abstract number concepts.
• Challenge: Ask more able students to find one more and one less for numbers beyond 50 or to explain why the number line "moves" the way it does.
• Use questioning to deepen reasoning (e.g., "What happens if you keep finding one more? Where do we stop?")

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Assessment Opportunities

• Observation during practical activities to note ability to count forwards and backwards by one.
• Check accuracy in recording number sentences on whiteboards or in books.
• Listening to oral responses during quick-fire rounds.
• Informal discussion to assess depth of conceptual understanding.

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Teacher Notes & Tips

• Make sure the physical objects are engaging and easy to handle — hands-on experience makes abstract maths tangible for this age.
• Use enthusiastic language and praise to build confidence around numbers.
• Connect one more/one less language to everyday contexts (e.g., “If you have 3 apples and get one more, how many?”)
• Be ready to re-explain with visual aids or peer demonstration when necessary.
• Use this first lesson to set a positive tone for the rest of the unit by making maths fun and interactive.

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End of Lesson 1 – Introduction to One More and One Less