Math 2 Lesson: 47 + 5

### 1.1. Knowledge to remember

Set and calculate: 47 + 5

7 plus 5 equals 12, write 2, remember 1.

4 add 1 equals 5, write 5.

So 47 + 5 = 52

### 1.2. Math forms

**Form 1: Performing the calculation**

– Set count, the numbers in the same row are placed in a straight column together.

– Perform addition of numbers in order from right to left.

**Form 2: Math quizzes**

– Read; Analyze the problem, determine the known information and requirements of the problem.

– Use the appropriate calculation to find the solution to the problem. Usually, we want to find the value of the quantity “more than”; To find “both” or “all”, I usually use addition.

– Present the solution and check the results of the problem.

### 1.3. Solving Textbook Exercises

**Lesson 1**

Calculate:

__Solution method__

Perform addition in order from right to left.

__Solution guide__

Lesson 2

Write the correct number in the blank:

__Solution method__

Add the two terms together and fill in the corresponding blank.

__Solution guide__

lesson 3

Solve the problem according to the following summary:

__Solution method__

To find the length of line segment AB, we take the length of line segment CD plus 8cm.

__Solution guide__

The length of line segment AB is:

17 + 8 = 25 (cm)

Answer: 25cm.

Lesson 4

Choose a letter that has a right answer:

The number of rectangles in the figure is:

A. 4 B. 5 C. 6 D. 9

__Solution method__

Count the rectangles; Match the puzzle and then count until the end.

__Solution guide__

In the figure, there are rectangles: 1; 2; 3; 4; 1+2; 3+4; 1+4; 2+3; 1+2+3+4.

So there are 9 rectangles in all.

**Circle the letter D.**

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