The document provides lessons on addition concepts for 2nd grade mathematics. It covers key topics such as adding to find totals, using parts to find wholes, related addition facts, counting on to add, making 10 to add, doubles facts, and adding multiple numbers. Examples and practice problems are provided to demonstrate addition concepts and build fluency with addition facts and calculations through grade 2.

1. M a t h e m a t i c s g r a d e 2 : Addition| 1
Addition Concepts
You can add to find how many when one group
joins another.
5 birds sit in a tree. 2 birds join them.
How many birds are in the tree?
7 birds are in the tree.
You can add parts together to find the whole.
Paul has 5 green cubes and 3 red cubes.
How many cubes does he have?
5 + 3 = 8
part plus part equals whole
Paul has 8 cubes.
1. addition การบวก 2. join นามารวมกัน 3. part แต่ละส่วน
4. whole ทั้งหมด 5. plus บวก, รวม 6. equal เท่ากับ

2. M a t h e m a t i c s g r a d e 2 : Addition| 2
Add
1.
7
1
8
2.
6
2
3.
4
6
4.
0
8
5.
6
5
6.
8
3
7.
4
3
8.
9
1
9.
7
4
10.
4
4
11. 5 + 7 = ___ 12. 4 + 8 =___ 13. 1 + 6 = ___
14. 6 + 3 = ___ 15. 0 + 2 = ___ 16. 2 + 4 = ___
17. 2 + 6 = ___ 18. 1 + 9 = ___ 19. 2 + 7 = ___
+ + + ++
+ + + ++

3. M a t h e m a t i c s g r a d e 2 : Addition| 3
Related Addition Facts
You can add These facts use
in any order. the same numbers.
These are related addition facts.
4
5
9
5
4
9
+ +
Related addition facts
จานวนจริงเกี่ยวกับการบวก

4. M a t h e m a t i c s g r a d e 2 : Addition| 4
9 9 9
9 9 9
Find the sum. Write the related addition fact.
1.
0
9
9
2.
5
6
3.
7
2
4.
8
1
5.
9
3
6.
1
9
7. 5 + 0 = 5
0 + 5 = 5
8. 2 + 8 =___
+ =
9. 4 + 7 = ___
+ =
10. 5 + 3 = ___
+ =
11. 2 + 6 = ___
+ =
16. 5 + 7 = ___
+ =
+ +
9
0
+ + + +
++ ++ +++ + +
99
sum ผลลัพธ์

5. M a t h e m a t i c s g r a d e 2 : Addition| 5
Count On to Add
Numbers you add are called addends.
3 + 5 = ?
When one added is 1, 2, or 3,
start with the greater addend.
Count on to find the sum.
Start at 5.
Count on 3.
6, 7, 8
3 addend
5 addend
8 sum
+
1. count on การนับเพิ่ม
2. addend ตัวตั้ง, ตัวบวก
3. sum ผลลัพธ์
4. greater มากกว่า

6. M a t h e m a t i c s g r a d e 2 : Addition| 6
Circle the greater addend. Find it on the number line.
Then count on to find the sum.
1. 7 + 1 = 8 2. 3 + 2 =___ 3. 2 + 8 = ___
4. 5 + 3 = ___ 5. 1 + 4 = ___ 6. 3 + 6 = ___
7.
5
1
8.
6
3
9.
1
9
10.
2
6
11.
3
7
+ + + ++
Cicle วงกลม
number line เส้นจานวน
greater มากกว่า

7. M a t h e m a t i c s g r a d e 2 : Addition| 7
Addition Sentences
Addition sentences use the symbols + and =
This is an These are related
addition sentence. addition sentences.
1.
8
5
13
2.
7
7
3.
8
9
4.
6
7
5.
9
5
6.
7
9
7.
9
4
8.
7
6
9.
7
8
10.
8
6
10 + 9 = 19
9 + 10 = 19
10 + 8 = 18
+ + + ++
+ + + ++
addition sentences ประโยคเกี่ยวกับการบวก
symbol สัญลักษณ์

8. M a t h e m a t i c s g r a d e 2 : Addition| 8
11.
5
7
12.
6
9
13.
9
9
14.
6
6
15.
4
7
16.
9
3
17.
8
4
18.
8
8
19.
9
2
20.
3
8
21. 6 + 8 = ___ 22. 8 + 7 = ___ 23. 9 + 10 = ___
24. 9 + 8 = ___ 25. 4 + 9 = ___ 26.10 + 10 = ___
27. 5 + 9 = ___ 28. 10 + 4 = ___ 29. 7 + 6 = ___
How are 6 + 8 = 14 and alike?
How are they different?
6
8
14
+ + + ++
+ + + ++
+
alike เหมือนกัน
different ต่างกัน

9. M a t h e m a t i c s g r a d e 2 : Addition| 9
Write the missing sums.
The addends are
the numbers in the first
column and first row.
The sums are inside
the addition table.
missing หายไป
column สดมภ์
row แถว

10. M a t h e m a t i c s g r a d e 2 : Addition| 10
8
7
15
Make 10 to Add
6 + 7 = ?
When one addend is 8 or 9,
you can add by making 10.
Break apart 7 to make 10.
Now let’s practice…..
+
Move 2
to make 10.
Make 10 to add ทาให้เป็น 10 ก่อนบวก
Break apart แยกจานวน

11. M a t h e m a t i c s g r a d e 2 : Addition| 11
+ +
+ +
Add by making 10. Draw and to help.
1. 8
4
12
2. 9
9
3. 9
3
4. 8
5
5. 7 + 5 =____ 6. 9 + 4 =____
7. 6 + 9 =____ 8. 8 + 5 =____

12. M a t h e m a t i c s g r a d e 2 : Addition| 12
Doubles Fact
Lee puts 3 stickers on the left page
of her sticker book. She puts 3 stickers
on the right page. How many stickers
does she put in her book?
3 + 3 = 6
Lee puts 6 stickers in her book.
When both addends are
the same number, the
fact is called
a doubles fact.
1. left ซ้ายมือ 2.right ขวามือ 3. how many เท่าไร
4. both ทั้งสอง 5. doubles fact จานวนคู่ที่เป็นจริง

13. M a t h e m a t i c s g r a d e 2 : Addition| 13
Count the dots. Write the doubles fact.
1.
____ + ____ = ____
2.
____ + ____ = ____
3.
____ + ____ = ____
1.
____ + ____ = ____
6.
____ + ____ = ____
7.
____ + ____ = ____
8. 4 + 4 = 8 9. 7 + 7 = ___ 10. 8 + 5 = ___
11. 9 + 9 = ___ 12. 6 + 8 = ___ 13. 1 + 1 = ___
14. 7 + 2 = ___ 15. 7 + 0 = ___ 16. 5 + 5 = ___
Dot จุด

14. M a t h e m a t i c s g r a d e 2 : Addition| 14
17.
5
3
18.
7
7
19.
8
4
20.
0
0
21.
6
2
22.
10
10
23.
5
4
24.
8
8
25.
9
4
26.
4
5
27.
5
7
28.
6
9
29.
9
9
30.
6
6
31.
5
7
32.
6
9
33. 34.
35.
5
7
36.
6
9
37. 38.
+ + + ++
+ + + ++
+ + ++
+ +
++
+ +
++

15. M a t h e m a t i c s g r a d e 2 : Addition| 15
You can use doubles facts
to help find other sums.
Doubles
6 + 6 = 12
Doubles + 1
6 + 7 = ?
Think
6 + 6 = 12
Since 7 is one
more than 6,
6 + 7 is one
more than 6 + 6.
6 + 7 = 13
Doubles – 1
6 + 5 = ?
Think
6 + 6 = 12
Since 7 is one
more than 6,
6 + 7 is one
more than 6 + 6.
6 + 5 = 11
Doubles +1 Doubles-1
more than มากกว่า

16. M a t h e m a t i c s g r a d e 2 : Addition| 16
Complete the facts.
Doubles
1. 9 + 9 = ___
Doubles +1
2. 6 + __ = __
Doubles - 1
3. 7 + __ = __
4. 7 + __ = __ 5. 8 + __ = __ 6. 9 + __ = __
7. 4 + __ = __ 8. 5 + __ = __ 9. 4 + __ = __
Remember, you can use
a doubles fact to help you.
Find the sum.
10. 4 + 5 = ___ 11. 7 + 1 = ___ 12. 8 + 8 = ___
13. 3 + 7 = ___ 14. 6 + 8 = ___ 15. 5 + 5 = ___
Complete สมบูรณ์
Doubles fact จานวนคู่ที่เป็นจริง

17. M a t h e m a t i c s g r a d e 2 : Addition| 17
Count on.
then add 8 + 3.
6
2 8
3 3
11
You can group addends in different ways.
Three Addends
Group doubles.
then add again.
2
7 4
2 7
11
Group to make 10.
then add again.
2
6 2
4 10
12
+
+ 7,
8
+ + + +

18. M a t h e m a t i c s g r a d e 2 : Addition| 18
Circle the addends you group. Then add.
1. 2.
5
5
6
3.
6
1
4
4.
7
3
8
5.
3
9
3
6.
4
3
6
7.
4
1
7
8.
4
4
3
9.
7
1
9
17
10.
4
7
4
11.
6
4
3
12.
5
2
3
13. 14.
1 + 5 + 9 = ?
__ + __ + __ = __
15.
2 + 6 + 8 = ?
__ + __ + __ = __
16.
8 + 1 + 2 = ?
__ + __ + __ = __
+ + + + + +
+++ ++ ++ +
+ + ++

19. M a t h e m a t i c s g r a d e 2 : Addition| 19
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Blom, L., Aitchison, J.J. Mathematics in English Grade 2 – Book 1.
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William H. Sadlier-Oxford, 2009.
Department of Education. Math Guide Book Grade K-2. Louisiana:
Louisiana Believes, 2012.
Dinah Zike. Math Connects Course2. San Diego, CA: The McGraw-Hill
Companies, 2011.
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