Whole Numbers 1-40 (Continued) Basic 1 Mathematics Lesson Note

Subject: Mathematics
Class: Primary 1
Topic: Whole Numbers 1-40 (Continued)
Duration: 35 minutes

Learning Objectives

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

• Count numbers from 31 to 40 and 1 to 40
• Count backwards from 40 to 1
• Write numbers 1-40 properly
• Identify numbers 1-40 as digits

1. COUNTING SKILL: Numbers 31-40

Let’s Learn 31 to 40: 

31 – THIRTY-ONE 

32 – THIRTY-TWO 

33 – THIRTY-THREE 

34 – THIRTY-FOUR 

35 – THIRTY-FIVE 

36 – THIRTY-SIX 

37 – THIRTY-SEVEN 

38 – THIRTY-EIGHT 

39 – THIRTY-NINE 

40 – FORTY

Exercise 1: Count from 31 to 40: 31, 32, 33, 34, 35, 36, 37, 38, 39, 40

Exercise 2: Fill in the missing numbers:

1. 31, 32, ___, 34, ___
2. 35, ___, 37, ___, 39
3. 33, 34, ___, 36, ___

Exercise 3: Count from 1 to 40 (in tens): 1-10: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 11-20: 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 21-30: 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 31-40: 31, 32, 33, 34, 35, 36, 37, 38, 39, 40

Exercise 4: Complete these sequences:

1. 28, 29, 30, ___, ___, ___
2. 36, 37, ___, ___, 40
3. 25, 26, 27, ___, ___, ___

2. REVERSE COUNTING: 40 to 1

Counting Backwards from 40: 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28… 3, 2, 1

Exercise 5: Count backwards from 40 to 31: 40, 39, 38, 37, 36, 35, 34, 33, 32, 31

Exercise 6: Fill in backwards counting:

1. 40, 39, ___, 37, ___
2. 35, 34, ___, 32, ___
3. 30, 29, ___, 27, ___

Exercise 7: Complete backwards from these numbers:

1. 38, 37, ___, ___, ___
2. 25, 24, ___, ___, ___
3. 33, 32, ___, ___, ___

Exercise 8: Count backwards in groups:

1. 40-31: 40, 39, ___, ___, ___, ___, ___, ___, ___, ___
2. 30-21: 30, 29, ___, ___, ___, ___, ___, ___, ___, ___
3. 20-11: 20, 19, ___, ___, ___, ___, ___, ___, ___, ___

3. WRITING SKILL: Numbers 1-40

Practice Writing Numbers 31-40:

Exercise 9: Trace numbers 31-35: 31 31 31 31 32 32 32 32 33 33 33 33 34 34 34 34 35 35 35 35

Exercise 10: Trace numbers 36-40: 36 36 36 36 37 37 37 37 38 38 38 38 39 39 39 39 40 40 40 40

Exercise 11: Write numbers 1-40 in order: 1-10: ___, ___, ___, ___, ___, ___, ___, ___, ___, ___ 11-20: ___, ___, ___, ___, ___, ___, ___, ___, ___, ___ 21-30: ___, ___, ___, ___, ___, ___, ___, ___, ___, ___ 31-40: ___, ___, ___, ___, ___, ___, ___, ___, ___, ___

Exercise 12: Write the missing numbers:

1. 29, 30, ___, 32, ___
2. 37, ___, 39, ___
3. 34, 35, ___, ___, 38

4. IDENTIFY NUMBERS 1-40 AS DIGITS

What are Digits? Digits are the symbols we use to write numbers: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

Single Digits: 1, 2, 3, 4, 5, 6, 7, 8, 9 Two Digits: 10, 11, 12, 13… 40

Exercise 13: Circle the single digit numbers: 5, 12, 8, 25, 3, 37, 9, 40, 1, 15

Exercise 14: Circle the two digit numbers: 6, 18, 4, 29, 7, 33, 2, 21, 8, 36

Exercise 15: How many digits do these numbers have?

1. 7 = _____ digit(s)
2. 23 = _____ digit(s)
3. 5 = _____ digit(s)
4. 40 = _____ digit(s)
5. 31 = _____ digit(s)

Exercise 16: Write the digits you see:

1. In 25: digits are _____ and _____
2. In 38: digits are _____ and _____
3. In 7: digit is _____
4. In 40: digits are _____ and _____

Exercise 17: Match numbers to their digit count:

• 15 → 1 digit
• 6 → 2 digits
• 32 → 1 digit
• 9 → 2 digits

Exercise 18: Sort these numbers by digit count: Numbers: 8, 22, 35, 4, 17, 9, 40, 3

One digit: _____________ Two digits: _____________

Homework

1. Practice counting from 1 to 40 and back to 1
2. Write numbers 31-40 five times each
3. Find numbers around your house and identify if they have 1 or 2 digits
4. Practice identifying digits in two-digit numbers
5. Count 35 objects at home and write the number

Teacher: Use number cards and point to individual digits to help pupils understand the concept of digits