Subtraction within 7

### 1.1. Knowledge to remember

– Subtraction table, how to do subtraction within 7

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

### 1.2. Maths for Subtraction within 7

**Form 1: Performing the calculation**

Calculate the value of subtraction within 7 using case-by-case methods.

**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 7 and then fill in the missing numbers or signs in the blanks.

### 1.3. Solving Textbook Exercises page 69

**Lesson 1 page 69**

Calculate:

**Solution method**

Perform the vertical subtraction of the numbers and then write the result in the blank.

__Solution guide__

**Lesson 2 page 69**

Calculate:

7 – 6 = 7 – 3 = 7 – 2 = 7 – 4 =

7 – 7 = 7 – 0 = 7 – 5 = 7 – 1 =

__Solution method__

Subtract the numbers and write the results in the blanks.

__Solution guide__

7 – 6 = 1 7 – 3 = 4 7 – 2 = 5 7 – 4 = 3

7 – 7 = 0 7 – 0 = 7 7 – 5 = 2 7 – 1 = 6

**Lesson 3 page 69**

Calculate:

7 – 3 – 2 = 7 – 6 – 1 = 7 – 4 – 2 =

7 – 5 – 1 = 7 – 2 – 3 = 7 – 4 – 3 =

__Solution method__

Subtract the numbers from left to right.

__Solution guide__

7 – 3 – 2 = 2 7 – 6 – 1 = 0 7 – 4 – 2 = 1

7 – 5 – 1 = 1 7 – 2 – 3 = 2 7 – 4 – 3 = 0

**Lesson 4 page 69**

Write the appropriate calculation:

__Solution method__

Look at the picture, count the number and write the appropriate calculation.

**Solution guide**

a) 7 – 2 = 5

b) 7 -3 = 4

### 1.4. Solving Textbook Exercises page 70

**Lesson 1 page 70**

Calculate:

**Solution method**

Add or subtract numbers along the lines and write the results in the blanks.

__Solution guide__

**Lesson 2 page 70**

Calculate:

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

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

7 – 6 = 7 -5 = 7 – 4 =

7 – 1 = 7 -2 = 7 – 3 =

__Solution method__

Perform the calculation and then write the result in the blank.

__Solution guide__

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

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

7 – 6 = 1 7 – 5 = 2 7 – 4 = 3

7 – 1 = 6 7 – 2 = 5 7 – 3 = 4

**Lesson 3 page 70**

Number ?

2 + ….= 7 1 + …. = 5 7 – …. = 1

7 – ….= 4 …. + 1 = 7 7 – …. = 3

….+ 3 = 7 ….. + 2 = 7 …. – 0 = 7

__Solution method__

Repeat the calculations within 7 learned and then fill in the missing number in the blank.

__Solution guide__

2 + 5 = 7 1 + 4 = 5 7 – 6 = 1

7 – 3 = 4 6 + 1 = 7 7 – 4 = 3

4 + 3 = 7 5 + 2 = 7 7 – 0 = 7

**Lesson 4 page 70**

Enter <; >; = fits in the dot:

3 + 4 …7 5 + 2….6 7 – 5 ….3

7 – 4 ….4 7 – 2…..5 7 – 6…..1

__Solution method__

– Calculate the value of each side.

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

__Solution guide__

3 + 4 = 7 5 + 2 > 6 7 – 5 < 3

7 – 4 < 4 7 - 2 = 5 7 - 6 = 1

**Lesson 5 page 70**

Write the appropriate calculation:

__Solution method__

Count the number of people in the picture and write the appropriate calculation.

**Solution guide**

The proper calculation is: 3 + 4 = 7.

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