Addition and subtraction formula table Basic addition and subtraction formula table

Addition and subtraction are the most basic mathematical operations. Let’s see how these formulas can help you! The following is the "Addition and Subtraction Formula Table Basic Addition and Subtraction Formula Table" compiled by me for your reference only. You are welcome to read it.

Table of addition formulas within 10

1+ 1= 2

1+ 2= 3 2+ 2= 4

1 + 3= 4 2+ 3= 5 3+ 3= 6

1+ 4= 5 2+ 4= 6 3+ 4= 7 4+ 4= 8

1+ 5= 6 2+ 5= 7 3+ 5= 8 4+ 5= 9 5+ 5=10

　1+ 6= 7 2+ 6= 8 3+ 6= 9 4+ 6=10 5+ 6=11 6+ 6=12

1+ 7= 8 2+ 7= 9 3+ 7=10 4+ 7=11 5+ 7=12 6+ 7=13 7+ 7 =14

1+ 8= 9 2+ 8=10 3+ 8=11 4+ 8=12 5+ 8=13 6+ 8=14 7+ 8=15 8+ 8=16 < /p>

1+ 9=10 2+ 9=11 3+ 9=12 4+ 9=13 5+ 9=14 6+ 9=15 7+ 9=16 8+ 9=17 9+ 9= 18

Addition table within 20

1+11=12 2+11=13 3+11=14 4+11=15 5+11=16 6+11= 17 7+11=18 8+11=19 9+11=20

1+12=13 2+12=14 3+12=15 4+12=16 5+12=17 6+ 12=18 7+12=19 8+12=20

1+13=14 2+13=15 3+13=16 4+13=17 5+13=18 6+13=19 7+13=20

1+14=15 2+14=16 3+14=17 4+14=18 5+14=19 6+14=20

1 +15=16 2+15=17 3+15=18 4+15=19 5+15=20

1+16=17 2+16=18 3+16=19 4+16= 20

1+17=18 2+17=19 3+17=20

1+18=19 2+18=20

1+19 =20

Table of subtraction formulas within 10

1-1=0

2-1= 1 2-2= 0

3-1= 2 3-2= 1 3-3= 0

4-1= 3 4-2= 2 4-3= 1 4-4= 0

5-1= 4 5-2= 3 5-3= 2 5-4= 1 5-5= 0

　6-1= 5 6-2= 4 6-3= 3 6-4 = 2 6-5= 1 6-6= 0

7-1= 6 7-2= 5 7-3= 4 7-4= 3 7-5= 2 7-6= 1 7 -7= 0

8-1= 7 8-2= 6 8-3= 5 8-4= 4 8-5= 3 8-6= 2 8-7= 1 8-8= 0

9-1= 8 9-2= 7 9-3= 6 9-4= 5 9-5= 4 9-6= 3 9-7= 2 9-8= 1 9- 9= 0

10-1=9 10-2=8 10-3=7 10-4=6 10-5=5 10-6=4 10-7=3 10-8=2 10-9=11 10-10=0

Subtraction formula within 20

11-1=10 11-2= 9 11-3= 8 11-4= 7 11 -5= 6 11-6= 5 11-7= 4 11-8= 3 11-9= 2 11-10=1

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12-2=10 12-3= 9 12-4= 8 12-5= 7 12-6= 6 12-7= 5 12-8= 4 12-9= 3 12-10=2

13-3=10 13-4= 9 13-5= 8 13-6= 7 13-7= 6 13-8= 5 13-9= 4 13-10=3

14-4=10 14-5= 9 14-6= 8 14-7= 7 14-8= 6 14-9= 5 14-10=4

15-5= 10 15-6= 9 15-7= 8 15-8= 7 15-9= 6 15-10=5

16-6=10 16-7= 9 16-8= 8 16- 9= 7 16-10=6

17-7=10 17-8= 9 17-9= 8 17-10=7

18-8=10 18-9 = 9 18-10=8

19-9=10 19-10=9

20-10=10

Extended reading:

Children's Rhymes with Addition and Subtraction Rhymes (1)

One, nine, one and nine are good friends, two, eight, two and eight hold hands,

Three, seven, three and seven are really close, four, six, four and six Let's go together.

Five or five people formed a pair of hands.

Children’s Rhymes for Addition and Subtraction (2)

When you see 9, you think of 1, when you see 8, you think of 2,

When you see 7, you think of 3, when you see 6 Thought 4.

When you see a large number plus a decimal, first change the positions of the two numbers.

Sample lesson plan about addition

Teaching objectives:

1. Through operations and demonstrations, know the meaning of addition; be able to read the addition formula correctly; have a preliminary understanding There are many problems in life that need to be solved using addition.

2. Through operations and expressions, cultivate hands-on ability and language expression ability; form a preliminary awareness of mathematical communication

3. Understand the connection between mathematical knowledge and life, stimulate interest in learning, Actively participate in mathematics activities to gain successful experience and enhance self-confidence.

Teaching focus: Understand the meaning of addition.

Teaching difficulties: Able to correctly observe realistic situation diagrams, verbally describe the meaning of the questions, and list calculation formulas.

Teaching process

(1) Understanding and merging in situations

1. Game introduction

(1) Video display (3 pieces The classmates were playing a game, and another classmate came (totaling 4 classmates).

Teacher: Please observe carefully and tell everyone what you see.

Teacher: Who is willing to tell everyone what you saw? (Complement each other based on the students’ speeches.)

The teacher regulates the students’ language: 3 students are shooting balls, and another one comes, totaling 4 students. (Let students say it repeatedly.)

2. Action demonstration

(3 pens and 1 pen, together are the process of 4 pens)

Teacher: Tell me what you saw? Tell your deskmate what you saw. (Make requests)

Students communicate with each other.

Teacher: Can you tell me what this picture means? Can you express it with gestures as you speak?

3. Understand merging during operation

(1) Give it a try. .(I'll do it, you do it)

Teacher: Please take out 3 discs first, and then 1 disc. The total is 4 discs.

Teacher: Can you share the process of setting it up with your deskmate?

(2) Reveal addition and understand merging in calculations

Teacher: Just now we watched the process of students playing games, the process of merging pencils and the process of placing discs. They all combine two items together to find out how much one is - they use addition calculations, and the formula is 3+1=4. (Write on the blackboard: 3+1=4.

)

Teacher: Can you read this equation? (If students will, let students try to read: 3 plus 1 equals 4)

Teacher: Do you recognize "+"? What does it mean? (: plus sign, means merge.)

Teacher: What does 3 mean? (3 students, 3 red balloons, 3 discs.)

Teacher: What does l mean? (1 student, l blue balloons, l discs)

Teacher: (For example: 3+1=4 means combining 3 pencils and 1 pencil together, it becomes 4 pencils .) Who can say that like me.

Who can explain the meaning of this picture like the teacher?

(3) Consolidation exercises

1. Look at the pictures and explain the meaning of the expressions. (Do the first question)

Teacher: Tell me, what did you see?

Teacher: What does 1+2=3 mean? (One female student and two male students are making origami cranes. Together they are 3 students.

Teacher: In this picture, can you still find the meaning of l+2=3? ( The students folded 1 blue paper crane and 2 yellow paper cranes, which together make 3 paper cranes.)

　2. Tell stories and choose pictures

Teacher: The classmate just now. You said it well! In order to reward the students, let's play a little game. The teacher will tell you a story first. He is talking about a card. Please quickly find which one from the calculation.

①Teacher: There are 3 squirrels on the tree, and 2 more squirrels are coming. In total, there are 5 squirrels. Think about it, which formula can you find?

< p> Teacher: Please speak the formula out loud.

Teacher: Who can tell me what the formula you found means?

②Teacher: It’s weekend, teacher. Go to the park. I found 4 cars in the parking lot. At this time, another car came. Now there are 5 cars in the parking lot.

(4) Summary of the whole lesson!

Teacher: What do you know from today’s study?

(5) Assignment

Teacher: In your life, have you encountered two problems? Do you know what symbols should be used to express the combination of parts?

2+2=4 Please make up a mathematical story based on the calculation and draw your story into a picture.