Addition Of Two 2-Digit Numbers Basic 2 Mathematics Lesson Note

Learning Objectives

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

• Count and identify numbers from 1-470 (focus on 450-470)
• Write numbers 450-470 and 1-470 in numerals and words
• Add two 2-digit numbers without exchanging or renaming
• Relate addition to real-life experiences (shopping, etc.)
• Solve real-life problems involving 2-digit addition
• Express numbers in expanded form (e.g., 96 = 9 tens + 6 units)

Lesson Content

Day 1: Counting to 470

New Number Range:

• Practice counting from 1-470
• Focus on numbers 450-470: 450, 451, 452… 470
• Learn to read: “four hundred and fifty-one”
• Write these numbers clearly and neatly

Number Formation:

• Practice writing 450, 455, 460, 465, 470
• Emphasize correct number formation
• Both numerals and words practice

Day 2: Expanded Form

What is Expanded Form? Breaking down numbers to show place values clearly.

Examples:

• 56 = 5 tens + 6 units = 50 + 6
• 73 = 7 tens + 3 units = 70 + 3
• 89 = 8 tens + 9 units = 80 + 9

Building Numbers:

• 4 tens + 7 units = 47
• 6 tens + 2 units = 62
• 9 tens + 5 units = 95

Day 3-4: Adding 2-Digit Numbers (No Exchanging)

What Does “No Exchanging” Mean?

• The sum of units column is 9 or less
• The sum of tens column is 9 or less
• No carrying over needed

Step-by-Step Method:

1. Write numbers in columns (tens and units)
2. Add the units column first
3. Add the tens column next
4. Write your answer

Example 1: 23 + 45

  T  U

   2  3

 + 4  5

 ——

   6  8

• Units: 3 + 5 = 8
• Tens: 2 + 4 = 6
• Answer: 68

Example 2: 34 + 52

  T  U

   3  4

 + 5  2

 ——

   8  6

• Units: 4 + 2 = 6
• Tens: 3 + 5 = 8
• Answer: 86

Day 5: Real-Life Applications

Shopping Examples: “At the market, Mom bought items worth 35 naira and 42 naira. How much did she spend altogether?” 35 + 42 = 77 naira

School Examples: “In the morning, 23 pupils came to school. In the afternoon, 34 more pupils came. How many pupils came to school that day?” 23 + 34 = 57 pupils

Examples in Class

Expanded Form Examples:

• 67 = 6 tens + 7 units = 60 + 7
• 84 = 8 tens + 4 units = 80 + 4
• 59 = 5 tens + 9 units = 50 + 9

Addition Examples:

Example 1:

  45

 + 32

 —-

   77

Example 2:

  26

 + 53

 —-

   79

Real-Life Examples:

Fruit Seller: “A fruit seller sold 45 oranges in the morning and 34 oranges in the evening. How many oranges did he sell altogether?” 45 + 34 = 79 oranges

Classroom Supplies: “Class A has 38 books and Class B has 41 books. How many books do both classes have together?” 38 + 41 = 79 books

Exercises

Exercise 1: Number Practice

Write these numbers:

1. Four hundred and fifty-three = ___
2. Four hundred and sixty-seven = ___
3. 458 in words = ___
4. 465 in words = ___

Count and fill the missing numbers: 5. 465, 466, ___, 468, ___, 470

Exercise 2: Expanded Form

Write in expanded form:

1. 57 = ___ tens + ___ units = ___ + ___
2. 84 = ___ tens + ___ units = ___ + ___
3. 69 = ___ tens + ___ units = ___ + ___
4. 73 = ___ tens + ___ units = ___ + ___

Build these numbers: 5. 6 tens + 8 units = ___ 6. 5 tens + 4 units = ___ 7. 7 tens + 9 units = ___

Exercise 3: Addition Without Exchanging

Solve these addition problems:

1. 34 2. 25 3. 46 4. 53

• 42 + 31 + 23 + 35

1. 67 6. 28 7. 45 8. 36

• 21 + 41 + 34 + 52

Exercise 4: Horizontal Addition

1. 23 + 45 = ___
2. 56 + 32 = ___
3. 41 + 27 = ___
4. 64 + 25 = ___
5. 38 + 51 = ___

Exercise 5: Real-Life Problems

1. At a shop, Dad bought bread for 25 naira and milk for 32 naira. How much money did he spend altogether? 
2. In a school, there are 46 boys and 43 girls. How many pupils are there in total? 
3. A farmer collected 38 eggs in the morning and 41 eggs in the evening. How many eggs did he collect that day? 
4. Mary has 27 stickers and her friend gave her 42 more stickers. How many stickers does Mary have now? 

Exercise 6: Shopping Problems

1. Mom bought rice for 45 naira and beans for 34 naira. What was the total cost? 
2. A toy costs 28 naira and a book costs 41 naira. How much would both items cost together? 
3. John saved 35 naira in January and 44 naira in February. How much did he save altogether? 

Fun Activities

• Shopping Game: Use play money to practice addition while “shopping”
• Number Building: Use base-10 blocks to show expanded form
• Addition Race: Quick and accurate addition competitions
• Real Market: Set up a classroom market for practice

Homework

• Practice 10 addition problems daily (no exchanging)
• Write 5 numbers in expanded form
• Help parents add up costs when shopping
• Practice writing numbers 450-470

Assessment

• Can the child count to 470 accurately?
• Do they understand expanded form?
• Can they add two 2-digit numbers without exchanging?
• Can they apply addition to real-life situations?
• Do they show their work clearly using the column method?