Math 1 Lesson: Review: numbers up to 10

### 1.1. Knowledge to remember

– Know how to read, count, compare numbers within 10.

– Proficient in addition and subtraction within 10; relationship between addition and subtraction

– Find the unknown component of addition and subtraction within 10

– Proficient in solving and presenting word problems within 10

### 1.2. Math forms for Review : numbers up to 10

**Type 1: Read, count and compare numbers within 10**

The order of numbers, reading and writing of numbers within 10 are given in the following table:

**Form 2: Perform addition and subtraction within 10**

Memorize the addition and subtraction tables of numbers within 10 learned.

**Form 3: Math problems with words**

– Read and analyze the problem to determine the known numbers and requirements of the problem.

– For problems that require finding all or “both”, we often use addition. In contrast, with the problem that requires finding the “remaining” value, I often use subtraction to find the solution.

– Present the lesson clearly: Answers, calculations and answers.

– Check the solution and the results just found.

### 1.3. Solving Textbook Exercises page 170

**Lesson 1 page 170**

Write the numbers 0 to 10 under each line of the number line:

**Solution method**

Count up the numbers from 0 to 10 and then fill in the appropriate number in each line of the number line.

__Solution guide__

**Lesson 2 page 170**

Enter the sign >; < or = in the blank:

a) 9…..7 2….5 0….1 8…..6

7…..9 5…..2 1….0 6…..6

b) 6….4 3…..8 5….1 2…..6

4….3 8…..10 1….0 6…..10

6….3 3…..10 5….0 2…..2

__Solution method__

Count from 0 to 10, the number that counts first has less value.

__Solution guide__

a) 9 > 7 2 < 5 0 < 1 8 > 6

7 < 9 5 > 2 1 > 0 6 = 6

b) 6 > 4 3 < 8 5 > 1 2 < 6

4 > 3 8 < 10 1 > 0 6 < 10

6 > 3 3 < 10 5 > 0 2 = 2

**Lesson 3 page 170**

a) Circle the largest number: 6, 3, 4, 9.

b) Circle the smallest number: 5, 7, 3, 8.

__Solution method__

Compare numbers and then find the largest or smallest of the given numbers.

__Solution guide__

a) We have: 3 < 4 < 6 < 9

Circle the number 9.

b) We have: 3 < 5 < 7 < 8

Circle number 3.

**Lesson 4 page 170**

Write the numbers 10, 7, 5, 9 in order:

a) From childhood to adulthood: ……………………………………………………………………… ………….

b) From big to small: ………………………………………………………… ………….

__Solution method__

Compare and arrange the numbers in the given order.

__Solution guide__

a) From baby to adult: 5, 7, 9, 10.

b) From big to small: 10, 9, 7, 5.

**Lesson 5 page 170**

Measure the length of the line segments:

__Solution method__

– Use a ruler with centimeter divisions to measure the lengths of the straight lines.

– Set the 0cm line of the ruler to coincide with the beginning of the line segment; If the remaining points coincide with any line, that is the length of the line segment to be found.

**Solution guide**

Line segment AB is 5cm long.

Line segment MN is 9cm long.

The line segment PQ is 2cm long.

### 1.4. Solving Textbook Exercises page 171

**Lesson 1 page 171**

Calculate

**Solution method**

Add numbers within 10 and fill in the blanks with the result.

__Solution guide__

**Lesson 2 page 171**

Calculate:

a) 6 + 2 = 1 + 9 = 3 + 5 = 2 + 8 = 4 + 0 =

2 + 6 = 9 + 1 = 5 + 3 = 8 + 2 = 0 + 4 =

b) 7 + 2 + 1 = 8 + 1 + 1 = 9 + 1 + 0 =

5 + 3 + 1 = 4 + 4 + 0 = 1 + 5 + 3 =

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

__Solution method__

a) In addition, when two terms are swapped, the result does not change.

b) Perform calculations from left to right.

__Solution guide__

a) 6 + 2 = 8 1 + 9 = 10 3 + 5 = 8 2 + 8 = 10 4 + 0 = 4

2 + 6 = 8 9 + 1 = 10 5 + 3 = 8 8 + 2 = 10 0 + 4 = 4

b) 7 + 2 + 1 = 10 8 + 1 + 1 = 10 9 + 1 + 0 = 10

5 + 3 + 1 = 9 4 + 4 + 0 = 8 1 + 5 + 3 = 9

3 + 2 + 2 = 7 6 + 1 + 3 = 10 4 + 0 + 5 = 9

**Lesson 3 page 171**

Number ?

3 +..=7 6 – ….= 1 ….+ 8 = 8

…+ 5 = 10 9 – ….= 3 9 – 7 = ….

8 + …= 9 5 + … = 9 5 – … = 5

__Solution method__

Mentally calculate and fill in the blanks with the appropriate number.

__Solution guide__

3 + 4 = 7 6 – 5 = 1 0 + 8 = 8

5 + 5 = 10 9 – 6 = 3 9 – 7 = 2

8 + 1 = 9 5 + 4 = 9 5 – 0 = 5

**Lesson 4 page 171**

Match the points to get:

__Solution method__

Use a straightedge to connect the given points to form the required shape.

**Solution guide**

### 1.5. Solving Textbook Exercises page 172

**Lesson 1 page 172**

Number ?

2 = 1 + …. 8 = 7 + …… 9 = 5 + …..

3 = 2 + …. 8 = …. + 2 9 = … + 3

5 = 4 + … 8 = …. + 4 10 = …. + 4

7 = … + 2 6 = 4 + …. 10 = 8 + ….

**Solution method**

Mentally add numbers within 10 and then fill in the missing number in the blank.

__Solution guide__

2 = 1 + 1 8 = 7 + 1 9 = 5 + 4

3 = 2 + 1 8 = 6 + 2 9 = 7 + 2

5 = 4 + 1 8 = 4 + 4 10 = 6 + 4

7 = 5 + 2 6 = 4 + 2 10 = 8 + 2

**Lesson 2 page 172**

Write the correct number in the blank:

__Solution method__

Perform the calculation from left to right and then fill in the result in the empty box.

__Solution guide__

Do the following calculations:

6 + 3 = 9 9 – 5 = 4 8 + 2 = 10

4 + 2 = 6; 6 + 3 = 9 9 – 3 = 6; 6 – 1 = 5

Fill in the blanks, we get the following result:

**Lesson 3 page 172**

Lan folded 10 boats, Lan gave me 4 boats. How many boats do Lan have left?

__Solution method__

**Summary**

Yes: 10 boats

For: 4 boats

Left: …the boat?

**The answer**

To find the number of remaining boats, subtract the number of boats from the original number of boats.

__Solution guide__

Lan left the number of boats is:

10 – 4 = 6 (the boat)

Answer: 6 boats.

**Lesson 4 page 172**

Draw a line segment MN of length 10cm.

__Solution method__

– Mark the position of two points M, N with a ruler and pencil.

– Connect two points to form the line segment MN.

**Solution guide**

**Step 1:** Mark point M coincident with the 0cm line on the ruler, point N coincides with the 10cm line on the ruler.

**Step 2:** Keeping the ruler in place, connect two points M and N.

### 1.6. Textbook Exercises Page 173

**Lesson 1 page 173**

Calculate:

**Solution method**

Find the values of the calculations and then fill the results in the table.

__Solution guide__

**Lesson 2 page 173**

Calculate:

5 + 4 = 1 + 6 = 4 + 2 = 9 + 1 = 2 + 7 =

9 – 5 = 7 – 1 = 6 – 4 = 10 – 9 = 9 – 2 =

9 – 4 = 7 – 6 = 6 – 2 = 10 – 1 = 9 – 7 =

__Solution method__

Mentally calculate the value of addition and then quickly fill in the results of the two related subtractions.

__Solution guide__

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

9 – 5 = 4 7 – 1 = 6 6 – 4 = 2 10 – 9 = 1 9 – 2 = 7

9 – 4 = 5 7 – 6 = 1 6 – 2 = 4 10 – 1 = 9 9 – 7 = 2

**Lesson 3 page 173**

Calculate:

9 – 3 – 2 = 7 – 3 – 2 = 10 – 5 – 4 =

10 – 4 – 4 = 5 – 1 – 1 = 4 + 2 – 2 =

__Solution method__

Perform calculations from left to right.

__Solution guide__

9 – 3 – 2 = 6 – 2 = 4

10 – 4 – 4 = 6 – 4 = 2

7 – 3 – 2 = 4 – 2 = 2

5 – 1 – 1 = 4 – 1 = 3

10 – 5 – 4 = 5 – 4 = 1

4 + 2 – 2 = 6 – 2 = 4

**Lesson 4 page 173**

There are 10 chickens and ducks in all, including 3 chickens. How many ducks are there?

__Solution method__

*Summary*

All: 10 children

Chicken: 3 chickens

Duck?

**The answer**

To find the number of ducks, subtract 10 from the number of chickens given.

**Solution guide**

The number of ducks is:

10 – 3 = 7 (child)

Answer: 7 children.

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