Subtraction within 10

### 1.1. Knowledge to remember

– How to do subtraction within 10

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

### 1.2. Maths for Subtraction within 10

**Form 1: Performing the calculation**

Calculate the value of subtractions within 10

**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 10 and then fill in the blanks with the missing number or sign.

### 1.3. Solve textbook exercises pages 83, 84

**Lesson 1 page 83**

Calculate:

a)

b) 1 + 9 = 2 + 8 = 3 + 7 = 4 + 6 = 5 + 5 =

10 – 1 = 10 – 2= 10 – 3 = 10 – 4 = 10 – 5 =

10 – 9 = 10 – 8 = 10 – 7 = 10 – 6 = 10 – 0 =

__Solution method__

a) Subtract the numbers along the columns and write the results in the blanks.

b) Find the values of the calculations and then write the results in the blanks.

**Solution guide**

a)

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

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

10 – 9 = 1 10 – 8 = 2 10 – 7 = 3 10 – 6 = 4 10 – 0 = 10

**Lesson 2 page 83**

Number?

__Solution method__

Find pairs of numbers that sum to 10 and write the missing number in the blank.

__Solution guide__

**Lesson 3 page 84**

Put the appropriate <, >, = signs in the dot.

9….10 3 + 4 ….10 6….10 – 4

10….4 6 + 4 ….4 6 ….9 – 3

__Solution method__

– Find the value of calculations.

– Compare and then fill in the appropriate mark in the dot.

__Solution guide__

9 < 10 3 + 4 < 10 6 = 10 - 4

10 > 4 6 + 4 > 4 6 = 9 – 3

**Lesson 4 page 84**

Write the appropriate calculation:

**Solution method**

– Count all the pumpkins; the pumpkins Uncle Bear carried away and the remaining ones.

– Write the appropriate calculation.

__Solution guide__

The calculation is: 10 – 4 = 6.

### 1.4. Solving Textbook Exercises page 85

**Lesson 1 page 85**

Calculate:

a) 10 – 2 = 10 – 4 = 10 – 3 = 10 – 7 = 10 – 5 =

10 – 9 = 10 – 6 = 10 – 1 = 10 – 0 = 10 – 10 =

b)

**Solution method**

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

**Solution guide**

a) 10 – 2 = 8 10 – 4 = 6 10 – 3 = 7 10 – 7 = 3 10 – 5 = 5

10 – 9 = 1 10 – 6 = 4 10 – 1 = 9 10 – 0 = 10 10 – 10 = 0

b)

**Lesson 2 page 85**

Number ?

5 + …. = 10 …. – 2 = 6 10 – …. = 4 2 + …. = 9

8 – …. = 1 …. + 0 = 10 10 – ….= 8 4 + …. = 7

__Solution method__

Mental calculation within 10 learned and then write the missing number in the blank.

__Solution guide__

5 + 5 = 10 8 – 2 = 6 10 – 6 = 4 2 + 7 = 9

8 – 7 = 1 10 + 0 = 10 10 – 2 = 8 4 + 3 = 7

**Lesson 3 page 85**

Write the appropriate calculation:

__Solution method__

Count the number of objects, determine which items are added or subtracted, and then write the appropriate calculation.

__Solution guide__

a) 7 + 3 = 10

b) 10 – 2 = 8

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