Mathematics Primary 1 Second Term Lesson Notes – Week 5
Subject: Mathematics
Class: Primary One
Term: Second Term
Week: Five (5)
Age: 5 – 6 years
Topic: Addition of Numbers
Sub-topic: Addition of One-digit and Two-digit Numbers (Sum Not More Than 20)
Duration: 40 minutes
Behavioural Objectives
By the end of this lesson, pupils should be able to:
- Define addition as the process of putting numbers together.
- Identify the plus (+) and equals (=) signs.
- Add two one-digit numbers correctly.
- Add two-digit numbers with sums not more than 20.
- Solve simple addition problems using objects.
- Represent addition with pictures and symbols.
- Write addition statements correctly.
- Apply addition in real-life situations.
- Participate actively during group counting.
- Demonstrate confidence in answering addition questions.
Keywords and Meanings
- Addition – The act of putting numbers together to get a total.
- Plus (+) – A sign that shows we are adding numbers.
- Equals (=) – A sign that shows the answer or total.
- Sum – The total we get after adding.
- Digits – Numbers like 0, 1, 2, 3, 4, 5, etc.
- Count – To say numbers in order.
- Total – The result when numbers are added together.
- Combine – To join two or more things.
- Together – Putting two things as one.
- Objects – Things we can touch and use for counting.
Set Induction (Attention-Grabbing Story)
The teacher begins with a simple story:
“Last Saturday, Emeka and Ada went to buy oranges. Emeka bought 6 oranges, and Ada bought 4 oranges. They poured everything into one basket. When they counted, they had 10 oranges altogether! The teacher asks, ‘What did Emeka and Ada do?’ (They added their oranges!)”
The story draws the pupils’ attention to real-life addition—putting numbers together.
Entry Behaviour
Pupils have learned how to count numbers from 1 to 100 in previous weeks and can identify one-digit and two-digit numbers.
Learning Resources and Materials
- Flashcards with numbers (1–20)
- Counting sticks, bottle tops, or stones
- Addition chart or poster
- Whiteboard and marker
- Worksheets
Building Background / Connection to Prior Knowledge
The teacher reminds pupils of how they counted objects and grouped them in previous lessons. The teacher explains that addition means joining two groups together to make one big group.
Embedded Core Skills
- Numeracy Skills
- Problem-Solving Skills
- Communication Skills
- Collaboration and Critical Thinking
- Creativity and Logical Reasoning
Reference Materials
- Lagos State Unified Scheme of Work
- New Method Mathematics for Primary Schools (Book 1)
- Basic Mathematics Made Easy – UBE Edition
Instructional Materials
- Chart showing addition examples
- Number flashcards
- Worksheets and counters
Content Development
Meaning of Addition
Addition is the process of putting two or more numbers together to find the total or sum.
It helps us know how many things we have altogether.
Addition Signs
- The plus sign (+) means add.
- The equals sign (=) means is equal to or the same as.
Examples of Simple Additions
- 1 + 1 = 2
- 2 + 3 = 5
- 4 + 2 = 6
- 5 + 5 = 10
- 6 + 2 = 8
- 7 + 3 = 10
- 8 + 2 = 10
- 9 + 1 = 10
- 10 + 5 = 15
- 7 + 6 = 13
Explanation with More Examples
Example 1:
Chidera has 4 pencils. Her brother gives her 3 more.
Total pencils = 4 + 3 = 7
Example 2:
Uche has 5 sweets. His friend gives him 4 more.
Total sweets = 5 + 4 = 9
Example 3:
There are 6 birds on a tree and 2 more join them.
Total birds = 6 + 2 = 8
Example 4:
A class has 10 boys and 9 girls.
Total pupils = 10 + 9 = 19
Example 5:
Musa has 8 mangoes, and his friend gives him 2 more.
Total mangoes = 8 + 2 = 10
Presentation Steps
- Step 1: The teacher revises the previous topic (counting 1–100).
- Step 2: The teacher introduces the new topic “Addition of Numbers” and writes examples on the board.
- Step 3: The teacher explains the meaning of addition using real-life examples and counting objects.
- Step 4: The teacher demonstrates using sticks or bottle tops.
- Step 5: Pupils practice simple addition with objects and numbers.
- Step 6: The teacher gives correction and feedback.
Teacher’s Activities
- Explain the concept of addition clearly.
- Demonstrate using real objects.
- Write sample problems on the board.
- Ask pupils to solve and explain their answers.
- Guide pupils in group work.
Learners’ Activities
- Listen and observe the demonstration.
- Participate in group counting.
- Solve addition exercises on the board or in books.
- Explain their answers aloud.
Class Activity Discussion (10 FAQs with Answers)
- Q: What is addition?
A: Addition means putting numbers together. - Q: What sign do we use in addition?
A: The plus sign (+). - Q: What does the equals sign (=) mean?
A: It shows the total or answer. - Q: What is 3 + 2?
A: 5 - Q: What is 4 + 4?
A: 8 - Q: Can we add things we can count?
A: Yes, like sweets, pens, and balls. - Q: What is the sum of 6 and 2?
A: 8 - Q: What happens when we add zero?
A: The number stays the same. - Q: Why do we add?
A: To know how many we have in total. - Q: What is 10 + 9?
A: 19
Evaluation Questions
A. Fill-in-the-Blank (Choose a, b, c, or d)
- 2 + 3 = ___ (a) 4 (b) 5 (c) 6 (d) 7
- 5 + 5 = ___ (a) 10 (b) 9 (c) 8 (d) 6
- 4 + 1 = ___ (a) 3 (b) 4 (c) 5 (d) 6
- 6 + 2 = ___ (a) 8 (b) 9 (c) 10 (d) 7
- 3 + 6 = ___ (a) 8 (b) 9 (c) 7 (d) 6
- 10 + 5 = ___ (a) 14 (b) 15 (c) 13 (d) 12
- 9 + 1 = ___ (a) 8 (b) 9 (c) 10 (d) 11
- 7 + 2 = ___ (a) 8 (b) 9 (c) 10 (d) 7
- 8 + 2 = ___ (a) 9 (b) 10 (c) 11 (d) 12
- 6 + 4 = ___ (a) 9 (b) 10 (c) 8 (d) 11
B. Short Answer Questions
- What is addition?
- Write the sign used for addition.
- What is the result of 2 + 2?
- Add 3 and 4.
- Add 6 and 2.
- What is the sum of 10 and 9?
- What is 5 + 5?
- What is the total of 8 and 1?
- Add 7 and 3.
- What is 4 + 4?
Assessment
The teacher marks pupils’ work, gives praise, and corrects errors.
Conclusion
The teacher concludes by reminding pupils that addition means putting things together to get a total. Pupils recite examples aloud as a chant:
“1 + 1 = 2, 2 + 2 = 4, 3 + 3 = 6…”
Addition of Numbers
Learn how to add one-digit and two-digit numbers (sum not more than 20) with this engaging Lagos State-approved Primary 1 Mathematics lesson.
Teach Primary 1 pupils how to add one-digit and two-digit numbers (up to 20) with fun examples and class activities.
Internal Links (Lessonshabitat.com)
External Links
