Math 2 Lesson: Sum of many numbers

### 1.1. Knowledge to remember

Need to know the concept of the sum of many numbers and how to perform calculations.

### 1.2. Math forms

**Form 1: Performing the calculation**

– With the expression: I add the numbers from left to right in turn.

– With vertical addition: I add from units to tens, pay attention to remembering addition.

**Form 2: Add numbers with the same unit of measure**

– When the terms have the same unit of measure, you perform the addition of the numbers and keep the unit of measure in the sum.

**Form 3: Math Quiz**

– Read and analyze the problem: The problem usually gives the value of the components, requires finding the value of all.

– Find the solution of the problem: To find the value of all quantities, we usually take the given component values and add them together.

– Presentation of the problem.

– Check the solution and the results you just found.

### 1.3. Solving Textbook Exercises

**Lesson 1**

Calculate:

3 + 6 + 5 = 8 + 7 + 5 =

7 + 3 + 8 = 6 + 6 + 6 + 6 =

__Solution method__

Take turns adding the numbers from left to right.

__Solution guide__

3 + 6 + 5 = 14 8 + 7 + 5 = 20

7 + 3 + 8 = 18 6 + 6 + 6 + 6 = 24

**Lesson 2**

Calculate:

__Solution method__

Add the numbers in the same row in order from right to left.

__Solution guide__

**lesson 3**

Number?

__Solution method__

Look at the pictures and then fill in the blanks with the correct number.

Add the numbers you just found and write in the result.

__Solution guide__

a) 12kg + 12kg + 12kg = 36kg

b) 5l + 5l + 5l + 5l = 20l

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