Subtraction within 5

### 1.1. Knowledge to remember

– How to do subtraction within 5

– 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 5

**Form 1: Performing the calculation**

Calculate the value of subtractions within 5

**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: Fill in the missing element in the calculation**

Repeat the learned addition and subtraction of numbers within 5 and then fill in the missing numbers or signs in the blanks.

### 1.3. Textbook Exercises Page 59

**Lesson 1 page 59**

Calculate:

2 – 1 = 3 – 2 = 4 – 3 = 5 – 4 =

3 – 1 = 4 – 2 = 5 – 3 =

4 – 1 = 5 – 2 =

5 – 1 =

__Solution method__

Perform the subtraction within 5 and then fill in the blank with the result.

**Solution guide**

2 – 1 = 1 3 – 2 = 1 4 – 3 = 1 5 – 4 = 1

3 – 1 = 2 4 – 2 = 2 5 – 3 = 2

4 – 1 = 3 5 – 2 = 3

5 – 1 = 4

**Lesson 2 page 59**

Calculate:

5 – 1 = 1 + 4 = 2 + 3 =

5 – 2 = 4 + 1 = 3 + 2 =

5 – 3 = 5 – 1 = 5 – 2 =

5 – 4 = 5 – 4 = 5 – 3 =

__Solution method__

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

__Solution guide__

5 – 1 = 4 1 + 4 = 5 2 + 3 = 5

5 – 2 = 3 4 + 1 = 5 3 + 2 = 5

5 – 3 = 2 5 – 1 = 4 5 – 2 = 3

5 – 4 = 1 5 – 4 = 1 5 – 3 = 2

**Lesson 3 page 59**

Calculate:

__Solution method__

Subtract the numbers vertically and fill in the blanks with the result.

**Solution guide**

**Lesson 4 page 59**

Write the appropriate calculation:

**Solution method**

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

**Solution guide**

### 1.4. Solving Textbook Exercises page 60

**Lesson 1 page 60**

Calculate:

**Solution method**

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

__Solution guide__

**Lesson 2 page 60**

Calculate:

5 – 1 – 1 = 4 – 1 – 1 = 3 – 1 – 1 =

5 – 1 – 2 = 5 – 2 – 1 = 5 – 2 – 2 =

__Solution method__

Subtract numbers from left to right.

__Solution guide__

5 – 1 – 1 = 3 4 – 1 – 1 = 2 3 – 1 – 1 = 1

5 – 1 – 2 = 2 5 – 2 – 1 = 2 5 – 2 – 2 = 1

**Lesson 3 page 60**

Fill in the space with >, < or = signs:

5 – 3…2 5 – 4….2 5 – 1….3

5 – 3…3 5 – 4..1 5 – 4….0

__Solution method__

– Calculate the value of each side.

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

__Solution guide__

5 – 3 = 2 5 – 4 < 2 5 - 1 > 3

5 – 3 < 3 5 - 4 = 1 5 - 4 > 0

**Lesson 4 page 60**

Write the appropriate calculation:

__Solution method__

– Count the number of all the objects in each figure; the number of objects reduced and the number of objects remaining.

– Write the appropriate calculation.

__Solution guide__

**Lesson 5 page 60**

Number?

5 – 1 = 4 + …

__Solution method__

– Step 1: Calculate the value of the left side.

– Step 2: Find the appropriate number so that 4 plus that number equals the result found in step 1.

__Solution guide__

5 – 1 = 4 + 0

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