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 1-410
• Write numbers 390-410 and 1-410 in numerals and words
• Identify the addition sign (+) and related terms
• Add two 2-digit numbers without exchanging/renaming
• Create and solve addition stories
• Solve real-life addition problems

Lesson Content

Day 1: Counting to 410

New Number Range:

• Practice counting from 1-410
• Focus on numbers 390-410: 390, 391, 392… 410
• Learn to read and write these numbers
• Practice number recognition and writing

Day 2: Understanding Addition

The Addition Sign (+): The + sign means “add” or “put together”

Other Words for Addition:

• Add
• Plus
• Sum
• Total
• Altogether
• Combined

Example: “What is the sum of 23 and 15?” means “What is 23 + 15?”

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

What is “No Renaming”? This means we don’t need to carry over or exchange numbers. The sum of each column (units and tens) is less than 10.

Method:

1. Write the numbers one under the other
2. Add the units column first
3. Add the tens column next
4. Write your answer

Example 1:

 23

+ 15

—-

  38

• Units: 3 + 5 = 8
• Tens: 2 + 1 = 3
• Answer: 38

Example 2:

 42

+ 26

—-

  68

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

Day 5: Addition Stories and Real-Life Problems

Creating Addition Stories:

• “Tom has 23 marbles. His friend gives him 14 more marbles. How many marbles does Tom have now?”
• 23 + 14 = 37 marbles

Solving Real-Life Problems:

• Shopping: “Mom bought 25 apples and 13 oranges. How many fruits did she buy altogether?”
• School: “Class A has 32 pupils and Class B has 26 pupils. How many pupils are there in both classes?”

Examples in Class

Step-by-Step Examples:

Example 1: 34 + 23

Step 1: Write numbers    Step 2: Add units    Step 3: Add tens

   34                       34                   34

 + 23                   + 23              + 23  

 —-                     —-                 —-

                                                    57

Units: 4 + 3 = 7, Tens: 3 + 2 = 5, Answer: 57

Example 2: 41 + 28

  41

 + 28

 —-

   69

Units: 1 + 8 = 9, Tens: 4 + 2 = 6, Answer: 69

Real-Life Examples:

At the Market: “Dad bought 35 bananas and 22 pineapples. How many fruits did he buy?” 35 + 22 = 57 fruits

In the Library: “Shelf A has 43 books and Shelf B has 25 books. How many books are on both shelves?” 43 + 25 = 68 books

Exercises

Exercise 1: Number Practice

Write these numbers:

1. Four hundred and five = ___
2. Four hundred and ten = ___
3. 398 in words = ___
4. 407 in words = ___

Exercise 2: Addition Terms

What do these words mean in math?

1. Sum = ___
2. Total = ___
3. Altogether = ___
4. Plus = ___

Exercise 3: Simple Addition

Solve these addition problems:

1. 23 2. 31 3. 42 4. 50

• 14 + 27 + 36 + 29

1. 63 6. 25 7. 71 8. 44

• 22 + 13 + 18 + 35

Exercise 4: Horizontal Addition

Solve these:

1. 32 + 25 = ___
2. 41 + 37 = ___
3. 53 + 24 = ___
4. 62 + 16 = ___

Exercise 5: Addition Stories

Solve these story problems:

1. Mary has 24 stickers. Her sister gives her 13 more stickers. How many stickers does Mary have now? 
2. A shop has 32 red balloons and 26 blue balloons. How many balloons are there altogether? 
3. Tom collected 45 bottle tops. His friend gave him 23 more. How many bottle tops does Tom have in total? 

Exercise 6: Real-Life Problems

1. In a school, there are 35 boys and 43 girls. How many pupils are there in the school? 
2. A farmer has 52 goats and 27 sheep. How many animals does he have altogether? 
3. Mrs. Johnson bought 24 oranges and 35 apples for her family. How many fruits did she buy in total? 

Fun Activities

• Addition Race: Solve addition problems quickly and correctly
• Story Creation: Make up your own addition stories
• Real Shopping: Practice addition with play money and items

Homework

• Practice 10 addition problems daily
• Create 3 addition stories using things at home
• Help parents add up items while shopping or cooking

Assessment

• Can the child count to 410 accurately?
• Do they understand addition terms and the + sign?
• Can they add two 2-digit numbers without renaming correctly?
• Can they create and solve addition stories?
• Can they apply addition to solve real-life problems?