Math 2 Lesson: 28 + 5

### 1.1. Knowledge to remember

How to set and calculate 28 + 5

Set count

8 plus 5 equals 13, write 3 remember 1.

2 add 1 equals 3, write 3

So 28 + 5 = 33

### 1.2. Math forms

**Form 1: Performing the calculation**

– Set the calculation and then calculate, perform the addition of numbers in order from right to left.

– Set in vertical columns, numbers in the same row are placed straight together.

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

**Form 2: Find the calculation that has a value equal to the given value.**

– Perform calculations.

– Match with the given topic results.

**Form 3: Math Quiz**

– Read and analyze the problem: Determine the given data, the amount of increase or decrease and the requirements of the problem.

– Find a solution: When the problem requires finding the value of “both” or “all”, I often use addition.

– Presentation of the solution: Write the solution, calculation and answer to the problem.

– Check the solution of the problem and the result you just found?

### 1.3. Solving Textbook Exercises

**Lesson 1**

Calculate:

__Solution method__

Perform addition of numbers from right to left.

__Solution guide__

What calculation does each number 51, 43, 47, 25 represent?

__Solution method__

Find the value of the calculations and then answer the questions of the problem.

__Solution guide__

We have : 38 + 5 = 43; 18 + 7 = 25; 28 + 9 = 37

48 + 3 = 51; 78 + 7 = 85; 39 + 8 = 47.

So:

51 is the result of 48 + 3

43 is the result of 38 + 5

47 is the result of 39 + 8

25 is the result of 18 + 7.

lesson 3

There are 18 chickens and 5 ducks. How many chickens and ducks are there?

__Solution method__

**Summary**

Chicken: 18 chickens

Ducks : 5 ducks

All: …. children?

**The answer**

To find the solution, add the number of chickens plus the number of ducks.

__Solution guide__

Both chickens and ducks have the number of children:

18 + 5 = 23 (child)

Answer: 23 children

Lesson 4

Draw a line segment of length 5cm.

__Solution method__

– Mark a point on the ruler.

– Right hand hold a pencil, left hand hold a ruler, place the ruler so that the 0cm line coincides with the point just marked, keep the ruler straight, mark the point coincident with the 5cm line on the ruler.

– Continue holding the ruler and then use a pencil to connect the two points you just marked along the edge of the ruler, write the names of the two points.

__Solution guide__

Students use a ruler with centimeter divisions. Draw from line 0 to line 5.

Using a ruler to connect those two points, we get a line segment 5 cm long.

.

=====

## Leave a Reply