Subtraction of Numbers Mathematics Primary 1 Second Term Lesson Notes Week 6

Mathematics Primary 1 Second Term Lesson Notes Week 6

Subject: Mathematics
Class: Primary 1
Term: Second Term
Week: 6
Age: 6-7 years
Topic: Subtraction of Numbers
Sub-topic: Subtraction of Two 1-Digit Numbers within 20, Subtraction of 1-Digit Numbers from 2-Digit Numbers within 20
Duration: 40 minutes

Behavioral Objectives:

At the end of the lesson, pupils should be able to:

1. Identify and count numbers from 110 to 120.
2. Write numbers from 1 to 120 in numerals.
3. Explain the term “subtraction” and list related terms such as minus, take away, less, fewer, reduce, lost, remain.
4. Identify the minuend and subtrahend in a subtraction equation.
5. Skip count forward and backward in 2s and 3s.
6. Subtract two whole numbers within 20.
7. Subtract a 1-digit number from a 2-digit number within 20.
8. Solve real-life problems using subtraction.
9. Subtract numbers on a number line.
10. Subtract zero from numbers and represent this using objects.

Keywords:

• Subtraction
• Minus
• Take away
• Fewer
• Less
• Reduce
• Minuend
• Subtrahend

Set Induction:

1. Start the lesson by asking pupils what happens when we take away things, like when we remove one apple from a group of apples.
2. Show a picture or an object (e.g., 5 pencils) and ask: “If I take 2 pencils away, how many are left?”

Entry Behavior:

• Pupils should already know how to count and identify numbers up to 100.
• Pupils should understand the concept of addition and be able to count objects.

Learning Resources and Materials:

• Flashcards with numbers from 110-120
• Objects (e.g., pencils, blocks, or fruit)
• Number lines
• Chart paper
• Markers
• Small group work materials (flashcards, chalkboard, etc.)

Building Background/Connection to Prior Knowledge:

• Review counting forward and backward up to 100.
• Discuss the concept of addition and how it is the opposite of subtraction.

Embedded Core Skills:

• Critical Thinking and Problem Solving: Solve subtraction problems using real-life examples.
• Collaboration and Communication: Work in groups to solve subtraction problems and discuss their solutions.
• Numeracy Skills: Counting numbers up to 120 and applying subtraction.

Instructional Materials:

• Flashcards with numbers 110-120
• Objects (for subtraction exercises)
• Chalkboard/whiteboard for writing equations
• Number line (for subtraction exercises)
• Worksheets with subtraction problems

Content:

1. Definition of Subtraction:
   • Subtraction is when we take away one number from another. It is the opposite of addition.
2. Related Terms:
   • Minus: To take away.
   • Take away: Another term for subtracting.
   • Less: Means a smaller amount.
   • Fewer: Means a smaller quantity.
   • Reduce: To make something smaller.
   • Remain: What is left after subtraction.
3. Minuend and Subtrahend:
   • Minuend: The number from which we subtract.
   • Subtrahend: The number that is being subtracted.
   • Example: In 12 – 5 = 7, 12 is the minuend, and 5 is the subtrahend.
4. Subtraction Equations:
   • 12 – 5 = 7
   • 17 – 11 = 6
   • 14 – 6 = 8
5. Subtraction using Objects:
   • Show 10 apples, take 3 away, and ask how many are left.
   • Write the equation 10 – 3 = 7 on the board.

Class Activity Discussion:

1. Pupils will count numbers from 110-120 aloud.
2. Group Work: In groups, pupils will subtract objects and write the equations. For example, “If you have 8 blocks and take away 3, how many blocks are left?”
3. Sing subtraction songs like “10 Green Bottles” to reinforce the concept of subtraction.

Teacher’s Activities:

1. Step 1: Revise counting up to 100.
2. Step 2: Introduce the term “subtraction” and provide examples of simple subtraction.
3. Step 3: Demonstrate subtraction with objects (e.g., removing pencils from a pile) and write the equations on the board.
4. Step 4: Use the number line to show subtraction.
5. Step 5: Encourage pupils to share real-life subtraction problems.

Learners’ Activities:

1. Count aloud from 110 to 120.
2. Work in pairs to solve subtraction problems with objects.
3. Answer questions such as “If we have 15 apples and take away 7, how many are left?”
4. Participate in the number line activity to show subtraction visually.

Assessment:

1. What is 12 – 5?
2. If you have 18 apples and take away 9, how many apples are left?
3. Count backward from 20 to 0.
4. Write the subtraction equation for 15 – 3.
5. How many are left if you subtract 2 from 9?
6. If you have 20 pencils and take away 7, how many pencils do you have?
7. Show how to subtract 8 from 12 using objects.
8. What is 10 – 0?
9. Subtract 6 from 11. What is the result?
10. If I subtract 5 from 15, what is left?

Conclusion:

1. Review the lesson with the pupils by asking them to explain subtraction in their own words.
2. Go around the class and provide feedback on their work.
3. Praise pupils who demonstrated a good understanding of subtraction and correct any mistakes.