Mathematics Grade 2 Term 3 – Week 6 Wednesday: Add/subtract multiples of 10 (0–50)

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Lesson Plan: Mental Maths & Comparisons

1. LESSON INFORMATION

  • Subject & Grade: Mathematics – Grade 2
  • Topic: Add/subtract multiples of 10 (0–50)
  • Duration: 60 minutes
  • CAPS Alignment: This lesson directly aligns with the CAPS Mathematics curriculum for Grade 2, Term 3, focusing on mental mathematics strategies. It addresses the specific requirement for learners to add and subtract multiples of 10 within the range 0-50, developing number sense and mental calculation skills as outlined in the Foundation Phase Mathematics curriculum. The lesson supports the CAPS emphasis on building computational fluency through concrete experiences and pattern recognition.
  • Learning Objectives:
  • Knowledge: Learners will know that multiples of 10 are numbers like 10, 20, 30, 40, 50 and understand the patterns when adding/subtracting multiples of 10 (0–50) to/from other numbers
  • Skills: Learners will be able to mentally add and subtract multiples of 10 (0–50) to/from given numbers, recognize patterns in tens, and use counting strategies to solve problems involving multiples of 10
  • Values: Learners will develop confidence in mathematical thinking, appreciate number patterns, and show perseverance when working with add/subtract multiples of 10 (0–50) problems
  • Key Vocabulary:
  • Multiples of ten (10, 20, 30, 40, 50)
  • Add/plus
  • Subtract/minus/take away
  • Tens and ones
  • Number patterns
  • Prerequisites: Learners should be able to count in tens to 50, recognize numbers 0-50, understand basic addition and subtraction concepts, and have experience with concrete manipulatives for number work.

2. RESOURCES AND MATERIALS

  • Concrete Manipulatives: Bundles of 10 counting sticks tied with elastic bands, loose counting sticks for ones, base-ten blocks (tens rods and unit cubes), 50 bottle tops organized in groups of 10, number cards 0-50
  • Visual Aids: Large hundred square (showing 0-50), number line 0-50 displayed prominently, chart showing multiples of 10 with pictures (10 apples, 20 oranges, etc.), pattern cards showing tens sequences
  • Technology: Interactive whiteboard or tablet for displaying number patterns (if available)
  • Stationery: Individual whiteboards and markers, worksheets with add/subtract multiples of 10 (0–50) problems, colored pencils, A4 paper
  • Assessment Tools: Observation checklist for add/subtract multiples of 10 (0–50) skills, individual assessment cards, group work rubric, exit ticket template

3. DETAILED LESSON STRUCTURE

Introduction (15 minutes)

  • Warm-up Activity: Begin with the “Counting in Tens” song: “Ten, twenty, thirty, forty, fifty – counting tens is really nifty! Clap your hands and stomp your feet, counting tens has such a beat!” Have learners stand and march while chanting, emphasizing the rhythm of multiples of 10. This directly prepares them for add/subtract multiples of 10 (0–50) work.
  • Prior Knowledge Activation: “Yesterday we learned about counting in tens. Today we’re going to use those tens to add and subtract! Let me show you 3 bundles of ten sticks. How many sticks do I have?” Allow learners to count: “10, 20, 30!” Then add one more bundle: “Now I’m adding 10 more. What do I have now?” This concrete demonstration introduces add/subtract multiples of 10 (0–50) concepts.
  • Lesson Introduction: “Today we are learning to add and subtract multiples of 10 between 0 and 50. Multiples of 10 are special numbers like 10, 20, 30, 40, and 50. We’re going to discover how easy it is to add/subtract multiples of 10 (0–50) when we understand the patterns!”
  • Learning Objectives Sharing: “By the end of our lesson, you will be able to quickly add 10, 20, 30, 40, or 50 to any number, and take away these amounts too! You’ll see how add/subtract multiples of 10 (0–50) follows special patterns that make math easier.”

Development (45 minutes)

  • *Phase 1: Concrete Exploration (15 minutes)**

Distribute bundles of 10 counting sticks to each pair of learners. “Let’s explore add/subtract multiples of 10 (0–50) using our stick bundles. Start with 2 individual sticks. Now add 1 bundle of 10. Count all your sticks – what do you have?” Guide learners to see they have 12 sticks total.

Continue with concrete examples: “Start with 15 sticks (1 bundle + 5 loose). Add 2 more bundles of 10. How many do you have now?” Learners physically manipulate materials to discover they have 35 sticks. “You just solved 15 + 20 = 35! This is add/subtract multiples of 10 (0–50) in action!”

For subtraction, demonstrate: “Start with 4 bundles of 10 plus 3 loose sticks (43 total). Take away 2 bundles of 10. What remains?” Learners remove 2 bundles and count 23 sticks remaining. “You solved 43 – 20 = 23!”

Ask guiding questions: “What happens to the ones when we add/subtract multiples of 10 (0–50)? Do they change?” Help learners discover that ones digits stay the same when adding or subtracting multiples of 10.

  • *Phase 2: Guided Practice (15 minutes)**

Move to semi-concrete representation using the large number line. “Let’s practice add/subtract multiples of 10 (0–50) on our number line. If I start at 8 and jump forward 20 spaces, where do I land?” Demonstrate jumping in groups of 10: “8 to 18 is one jump of 10, 18 to 28 is another jump of 10. So 8 + 20 = 28!”

Work through several examples together:

  • “Start at 15, add 30” (jump three times by 10: 15→25→35→45)
  • “Start at 47, subtract 20” (jump back twice by 10: 47→37→27)
  • “Start at 6, add 40” (jump four times by 10: 6→16→26→36→46)

Organize learners into groups of 4. Give each group number cards and have them create add/subtract multiples of 10 (0–50) problems for other groups to solve. “Group 1, show us your problem!” One group might display “12 + 30 = ?” and others solve using their manipulatives.

Encourage mathematical talk: “Explain how you solved 25 – 10.” Listen for responses like “I took away one bundle of 10, so 25 became 15” or “I jumped back one space of 10 on the number line.”

  • *Phase 3: Independent Application (15 minutes)**

Provide differentiated worksheets focusing on add/subtract multiples of 10 (0–50):

  • Level 1 (Support): Visual problems with pictures of tens bundles and ones. Example: “🔟🔟 + 🔟 = ?” (20 + 10 = 30)
  • Level 2 (Core): Standard notation problems: “17 + 20 = ___”, “35 – 10 = ___”, “8 + 30 = ___”
  • Level 3 (Extension): Word problems using South African contexts: “Nomsa has 15 rands. Her grandmother gives her 30 rands more. How much money does Nomsa have now?” or “There were 42 learners at school. 20 learners went home early. How many learners stayed?”

Circulate and observe learners working independently on add/subtract multiples of 10 (0–50) problems. Note who uses manipulatives, who draws pictures, and who calculates mentally. Provide individual support as needed.

Consolidation (15 minutes)

  • Summary Activity: Gather learners on the carpet. “Let’s play ‘Quick Fire Tens!’ I’ll give you add/subtract multiples of 10 (0–50) problems and you show me the answer using your finger numbers or number cards.” Call out problems like “23 + 10”, “45 – 20”, “7 + 40” and observe learners’ responses.
  • Reflection Questions:
  • “What did you notice about the ones digit when we add/subtract multiples of 10 (0–50)?”
  • “Which strategy helped you most – using sticks, the number line, or thinking in your head?”
  • “Can you create your own add/subtract multiples of 10 (0–50) problem for a friend?”
  • Connection to Next Lesson: “Tomorrow we’ll use what we learned about add/subtract multiples of 10 (0–50) to solve bigger problems and explore what happens when we add multiples of 10 to numbers greater than 50!”

4. ASSESSMENT STRATEGIES

  • Formative Assessment: Continuously observe learners during add/subtract multiples of 10 (0–50) activities. Note who grasps the concept quickly, who needs manipulatives, and who struggles with the pattern recognition. Use questioning to assess understanding: “How did you know that 16 + 20 = 36?”
  • Summative Assessment: Exit ticket with three add/subtract multiples of 10 (0–50) problems: one addition (14 + 30), one subtraction (48 – 20), and one word problem. This provides clear evidence of individual mastery.
  • Success Criteria:
  • Learners can correctly solve at least 7 out of 10 add/subtract multiples of 10 (0–50) problems
  • Learners can explain their thinking using mathematical language
  • Learners recognize that ones digits remain unchanged when adding/subtracting multiples of 10
  • Assessment Tools: Checklist including: “Uses manipulatives effectively”, “Recognizes patterns in add/subtract multiples of 10 (0–50)”, “Solves problems accurately”, “Explains mathematical thinking”
  • Recording Methods: Individual learner profiles noting progress with add/subtract multiples of 10 (0–50), anecdotal records of mathematical conversations, photographic evidence of learner work

5. DIFFERENTIATION STRATEGIES

  • Support for Struggling Learners: Provide additional concrete manipulatives, use smaller numbers within the 0-30 range for add/subtract multiples of 10 (0–50) practice, offer one-on-one guidance, and allow extra time for processing. Create visual anchor charts showing the patterns.
  • Extension for Advanced Learners: Challenge with add/subtract multiples of 10 (0–50) problems involving larger starting numbers, introduce multiple-step problems like “15 + 20 – 10”, or explore what happens when adding multiples of 10 to numbers approaching 50.
  • Inclusive Strategies: Use visual, auditory, and kinesthetic approaches to add/subtract multiples of 10 (0–50). Provide problems in learners’ home languages where possible, use peer support systems, and ensure all learners can access manipulatives.
  • Language Support: Display key vocabulary with visual representations, encourage mathematical talk in home languages first then English, provide sentence starters like “When I add ___ tens to ___, I get ___”
  • Learning Style Accommodations: Visual learners use number lines and charts, auditory learners participate in counting songs and verbal explanations, kinesthetic learners manipulate concrete objects for all add/subtract multiples of 10 (0–50) problems.

6. EXTENSION AND HOMEWORK

  • Optional Extension Activities: “Tens Hunt” – find groups of 10 objects at home and practice add/subtract multiples of 10 (0–50) with family members. Create a tens counting book showing South African animals in groups of 10.
  • Family Involvement: Send home a simple game where families practice add/subtract multiples of 10 (0–50) using household objects like spoons, buttons, or coins. Include instructions in multiple languages.
  • Cross-curricular Connections: Link add/subtract multiples of 10 (0–50) to Life Skills by counting classroom supplies, to English by reading number stories, and to Creative Arts by creating patterns with multiples of 10.

This comprehensive lesson plan ensures learners develop strong foundational skills in add/subtract multiples of 10 (0–50) through engaging, culturally relevant, and pedagogically sound activities that align with CAPS requirements and Foundation Phase best practices.