Odd And Even Numbers Basic 2 Mathematics Lesson Note

Learning Objectives

By the end of this week, pupils should be able to:

• Count and identify numbers from 1-570 (focus on 550-570)
• Write numbers 550-570 and 1-570 in numerals and words
• Identify odd and even numbers from 1-100
• Determine whether a group of objects has an odd or even number
• Understand that the sum of two odd numbers is even
• Recognize patterns in odd and even numbers

Lesson Content

Day 1: Counting to 570

New Number Range:

• Practice counting from 1-570
• Focus on numbers 550-570: 550, 551, 552… 570
• Learn to read: “five hundred and seventy”
• Practice writing these numbers clearly

Number Formation:

• Write 550, 555, 560, 565, 570
• Both numerals and words
• Emphasize neat, legible writing

Day 2-3: Understanding Odd and Even Numbers

What are Even Numbers?

• Numbers that can be divided into 2 equal groups
• End in 0, 2, 4, 6, or 8
• Examples: 2, 4, 6, 8, 10, 12, 14…

What are Odd Numbers?

• Numbers that cannot be divided into 2 equal groups
• Always have 1 left over when divided by 2
• End in 1, 3, 5, 7, or 9
• Examples: 1, 3, 5, 7, 9, 11, 13…

Memory Tricks:

• Even numbers are “friendly” – they like to pair up
• Odd numbers are “lonely” – there’s always one left out

Patterns from 1-20:

• Even: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20
• Odd: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19

Day 4: Testing with Objects

Using Objects to Test Odd/Even:

Example with 8 balls:

• Try to pair them: ⚽⚽ ⚽⚽ ⚽⚽ ⚽⚽
• All balls have partners = 8 is EVEN

Example with 7 pencils:

• Try to pair them: ✏️✏️ ✏️✏️ ✏️✏️ ✏️
• One pencil has no partner = 7 is ODD

Grouping Method:

• Put objects in groups of 2
• If no objects left over = EVEN
• If 1 object left over = ODD

Day 5: Adding Odd Numbers

Discovery: Two Odd Numbers Make an Even Number

Examples:

• 3 + 5 = 8 (odd + odd = even)
• 7 + 9 = 16 (odd + odd = even)
• 1 + 3 = 4 (odd + odd = even)

Why This Happens:

• Odd number = even number + 1
• When we add two odd numbers, the two extra 1s make a pair
• So the result is even!

Examples in Class

Identifying Odd and Even:

Numbers 1-20:

• Even: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20
• Odd: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19

Object Examples:

12 Marbles:

• Group them: ●● ●● ●● ●● ●● ●●
• No marbles left over = 12 is EVEN

15 Sweets:

• Group them: 🍬🍬 🍬🍬 🍬🍬 🍬🍬 🍬🍬 🍬🍬 🍬🍬 🍬
• One sweet left over = 15 is ODD

Adding Odd Numbers:

• 5 + 7 = 12 ✓ (even)
• 9 + 11 = 20 ✓ (even)
• 3 + 7 = 10 ✓ (even)

Exercises

Exercise 1: Number Practice

Write these numbers:

1. Five hundred and fifty-five = ___
2. Five hundred and sixty-eight = ___
3. 562 in words = ___
4. 567 in words = ___

Exercise 2: Identifying Odd and Even

Circle EVEN numbers, underline ODD numbers:

1. 15, 22, 37, 48, 53, 66, 71, 84, 99, 100 
2. 12, 25, 38, 41, 56, 63, 77, 82, 95, 98 

Exercise 3: Odd or Even?

Write “ODD” or “EVEN” for each number:

1. 23 = ___
2. 46 = ___
3. 67 = ___
4. 88 = ___
5. 95 = ___
6. 100 = ___

Exercise 4: Testing with Objects

Draw circles to group these objects in pairs. Then write if the total is odd or even:

1. 🌟🌟🌟🌟🌟🌟🌟 (7 stars) = ___
2. ⚽⚽⚽⚽⚽⚽⚽⚽⚽⚽ (10 balls) = ___
3. 🍎🍎🍎🍎🍎🍎🍎🍎🍎 (9 apples) = ___

Exercise 5: Counting Odd and Even

1. Count all even numbers from 2 to 20: ___, ___, ___, ___, ___, ___, ___, ___, ___, ___ 
2. Count all odd numbers from 1 to 19: ___, ___, ___, ___, ___, ___, ___, ___, ___, ___ 

Exercise 6: Adding Odd Numbers

Add these odd numbers and check if the answer is even:

1. 3 + 5 = ___ (even/odd?)
2. 7 + 9 = ___ (even/odd?)
3. 11 + 13 = ___ (even/odd?)
4. 15 + 17 = ___ (even/odd?)

Exercise 7: Real-Life Problems

1. There are 23 boys and 25 girls in a class. Is the total number of pupils odd or even? 
2. Mary has 18 stickers and John has 15 stickers. Is the total number of stickers odd or even? 
3. A shop has 47 apples and 35 oranges. Is the total number of fruits odd or even? 

Exercise 8: Pattern Recognition

Complete these patterns:

1. Even numbers: 2, 4, 6, ___, 10, ___, 14, ___
2. Odd numbers: 1, 3, 5, ___, 9, ___, 13, ___
3. Even numbers from 80: 80, 82, ___, 86, ___, 90
4. Odd numbers from 91: 91, 93, ___, 97, ___, ___

Exercise 9: 3-Digit Subtraction Practice

Solve these 3-digit subtraction problems (no regrouping):

1. 567 2. 489 3. 678

• 234 – 156 – 345

1. 789 5. 598

• 456 – 267

Fun Activities

• Odd/Even Sort: Sort number cards into odd and even piles
• Pairing Game: Use actual objects to test odd/even
• Number Line Walk: Step on odd or even numbers only
• Pattern Hunt: Find odd and even patterns around the classroom

Homework

• Practice identifying odd and even numbers from 1-50
• Group objects at home to test odd/even
• Practice 3-digit subtraction problems
• Look for odd and even house numbers on your street

Assessment

• Can the child count to 570 accurately?
• Do they correctly identify odd and even numbers?
• Can they test groups of objects for odd/even?
• Do they understand that two odd numbers make an even sum?
• Can they subtract 3-digit numbers without regrouping?