Subtraction within 4

### 1.1. Knowledge to remember

– How to do subtraction within 4

– The relationship between addition and subtraction.

– Represent the situation in the figure by calculation and application of subtraction just learned to real problems.

### 1.2. Maths for Subtraction within 4

**Form 1: Performing the calculation**

Calculate the value of subtractions within 4.

**Type 2: Calculates the value of an expression containing multiple addition and subtraction operations phép**

If an expression contains two or more addition and subtraction operations, you perform the calculations from left to right.

**Form 3: Compare**

– Perform the calculation of both sides.

– Compare and fill in the appropriate punctuation.

### 1.3. Textbook Exercises Page 56

**Lesson 1 page 56**

Calculate:

4 – 1 = 4 – 2 = 3 + 1 = 1 + 2 =

3 – 1 = 3 – 2 = 4 – 3 = 3 – 1 =

2 – 1 = 4 – 3 = 4 – 1 = 3 – 2 =

**Solution method**

Perform the subtraction and then fill in the blank with the result.

__Solution guide__

4 – 1 = 3 4 – 2 = 2 3 + 1 = 4 1 + 2 = 3

3 – 1 = 2 3 – 2 = 1 4 – 3 = 1 3 – 1 = 2

2 – 1 = 1 4 – 3 = 1 4 – 1 = 3 3 – 2 = 1

**Lesson 2 page 56**

Calculate:

__Solution method__

Subtract the numbers and then fill in the blanks.

__Solution guide__

**Lesson 3 page 56**

Write the appropriate calculation:

__Solution method__

Observe the picture, count the number and then write the appropriate calculation.

**Solution guide**

### 1.4. Textbook Exercises Page 57

**Lesson 1 page 57**

Calculate:

**Solution method**

Perform subtraction of numbers in range 4 and write the result in the blank.

__Solution guide__

**Lesson 2 page 57**

Number?

__Solution method__

Perform the calculation and then fill in the blank with the result.

__Solution guide__

**Lesson 3 page 57**

Calculate?

4 – 1 – 1 = 4 – 1 – 2 = 4 – 2 – 1 =

__Solution method__

Count from left to right.

__Solution guide__

4 – 1 – 1 = 2 4 – 1 – 2 = 1 4 – 2 – 1 = 1

**Lesson 4 page 57**

Put the appropriate <, >, = in the dot:

3 – 1….2 3 – 1…..3 – 2

4 – 1….2 4 – 3…..4 – 2

4 – 2….2 4 – 1…..3 + 1

__Solution method__

– Calculate the value of each side.

Compare and then fill in the blanks with the appropriate mark.

__Solution guide__

3 – 1 = 2 3 – 1 > 3 – 2

4 – 1 > 2 4 – 3 < 4 - 2

4 – 2 = 2 4 – 1 < 3 + 1

**Lesson 5 page 57**

Write the appropriate calculation:

__Solution method__

Observe the picture, count the number and then write the appropriate calculation.

**Solution guide**

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