Make sure the 1 -dozen math lesson and the unit, the children can easily convert tens and units, read and write the round digits, the structure of the 2 -digit numbers from which to develop mathematical capabilities. Parents can fully accompany their children to review and study this topic well through the sharing in the article below!
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Grade 1 math lesson and unit is an important knowledge, as a foundation for children to learn the next lessons such as comparing numbers within 100. According to the distribution of the current curriculum, this topic is divided into 2 lessons. In the first lesson, the first grade children will be familiar with the concept of “dozen”; In the second lesson, the children will get used to the concept of the structure of a 2 -digit number, including dozens and units.
At the end of the 1 -dozen math lesson and the unit in class, the child can:
Know how to convert 1 dozen equals 10 units.
Know how to read and can write dozens of numbers.
Identify the number of 2 -digit numbers and how to indicate its composition.
Apply to solve situations in real life.
Through the practice of lessons, applying, observing and exchanging, lessons about tens and units also help children develop mathematical competencies for themselves.
There are 3 types of math exercises parents should guide their children to identify 1 dozen, dozen round numbers and 2 -digit numbers. Specifically:
Identifying a dozen is the first type of basic exercise in the 1 -dozen math lesson and the unit I need to know. With this type of exercise, parents should repeat the knowledge so that their children can remember a dozen equal to how many units: “10 units equal to 1 dozen” (10 units = 1 dozen).
For example:
10 eggs = 1 dozen eggs
10 coconuts = 1 dozen coconuts.
10 plates = 1 dozen plates.
In order for children to remember knowledge and understand the lesson quickly, parents can let their children practice and repeat the theory that has just learned:
Parents told their children to take 10 sticks on the desk.
Count the number of sticks calculated in order from 1 to 10.
Parents explain to their children that they have just taken 10 sticks, also known as 1 dozen sticks. 10 sticks are equal to 1 dozen.
Let me repeat the sentence: “10 sticks are equal to 1 dozen”, “1 dozen = 10 sticks”.
Similar to this tip, parents can find any object in the house to practice: take 10 bowls (take 1 dozen bowls), take 10 plates (take 1 dozen plates), take 10 cups (take 1 dozen cups), take 10 pens (take 1 dozen pens) … when attaching the lesson with the lessons with the lessons with the lessons with the lessons with the lessons with the reality examples Close to everyday life, I will definitely understand the lesson faster!
Based on the cube blocks in the textbook, parents let their children observe and count them, the week is from 1 dozen, 2 dozen, 3 dozen to 4 dozen.
Identify 1 dozen: 10 cubes assigned to 1 bar => There are 10 cubes ie 1 dozen cubes. So “10 = 1 dozen”. Parents let their children repeat 10 = 1 dozen. Reading is “ten or a dozen”.
Identify 2 dozen: Take 20 cube blocks, combine 2 bars => 20 cubes, also called 2 dozen cubes. So “20 = 2 dozen”. Parents let their children repeat 20 = 2 dozen.
Identify 3 dozen: Take 30 cube blocks, paired into 3 bars => 30 cubes also called 3 dozen cubes. So “30 = 3 dozen”. Parents let their children repeat 30 = 3 dozen.
Identify 4 dozen: Take 40 cube blocks, paired into 4 bars => 40 cubes also called 4 dozen cubes. So “40 = 4 dozen”. Parents let their children repeat 40 = 4 dozen.
Similar to the numbers 50, 60, 70, 80 and 90, parents also explain such specific so that their children can identify the round numbers.
| Number | Dozen | How to read numbers |
| 10 | 1 dozen | Ten/ ten dozen |
| 20 | 2 dozen | Twenty/ twenty |
| 30 | 3 dozen | Thirty/ thirty |
| 40 | 4 dozen | Forty/ forty |
| 50 | 5 dozen | Fifty/ fifty |
| 60 | 6 dozen | Sixty/ sixty |
| 70 | 7 dozen | Seventy/ seventy |
| 80 | 8 dozen | Eighty/ eighty tens |
| 90 | 9 dozen | Ninety/ ninety dozen |
In the content of the 1 -dozen math lesson and the unit, the number of 2 -digit numbers is the knowledge that makes many children feel difficult to learn. However, parents also do not worry, just follow the companionship with you, you will soon understand the lesson and apply theory to solve the exercises of dozens of grade 1 units easily.
To start learning a 2 -digit number structure, parents should let their children observe and speak according to the form:
Observing the drawing to see the bar 10 and the cube, parents let their children count 10, 20, 30, 31, 32 respectively.
Explanation 32 is a 2 -digit number, number 3 first and 2 behind.
Number 3 is only 3 dozen cubes. Number 2 only 2 removable cubes.
Proceed to write number 3 in tens and 2 columns in the unit.
We will say the number 32 includes 3 dozen and 2 units.
Parents emphasize that for children to understand, the number of 2 -digit numbers includes 2 parts: dozen and units. The number of dozens in front, the number of units behind. Through this module, I can easily know 1 dozen equals how many units, 3 dozen are equal to how many units, 1 dozen equals a few units, number 12 including dozens and some units …
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After you have mastered the theoretical knowledge of Grade 1 and the unit, parents should join their children to start practicing Exercise on dozens and grade 1 units in the textbook of kite okay.
a/ Parents guide children to know the problem with 6 bundles of counting. Count each bundle of sticks with 10 sticks. Thus, we can count in groups of ten: ten, twenty, thirty, forty, fifty, sixty sticks. So there are 60 or 6 dozen sticks here.
Answer: 6 dozen sticks.
b/ Similarly, in this section, each husband has 10 bowls. Counting in the group of ten we have: ten, twenty, thirty, forty, fifty, sixty, seventy, seventy and eighty bowls. So there is a total of 80 or 8 dozen bowls.
Answer: 8 dozen bowls.
Paper tape with numbers with a number of boxes. Let children observe and think with the suggestion of the elephant. Looking at the problem we will see this is a paper tape The numbers dozens in order increased from 10 to 90.
The answers of the missing numbers are: 20, 40, 50, 60, 80 respectively.
After completing the exercise, parents let their children read the number in two ways: Read the usual number and read in dozen. Example 20 (Reading: twenty/ twenty).
Based on suggestions in textbooks, parents can practice playing with many objects. Parents are the ones who give their children to get enough of them or change their positions for their children to give the number and parents take the number of children.
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Applying knowledge about 2 -digit number structure, parents let their children practice according to the form after filling out the appropriate numbers on the “?”.
Parents teach their children to think: Among the 2 digits, the number first is only a dozen, the number behind the unit. For example: No. 12 consists of 1 dozen and 2 units.
Similarly the answer to the following sections as follows:
b/ No. 49 includes 4 dozen and 9 units.
c/ No. 80 includes 8 dozen and 0 units.
d/ No. 66 includes 6 dozen and 6 units.
In the first rope there are 3 different colors, each color has 10 seeds: 10 red seeds, 10 yellow seeds and 10 blue seeds. We will count respectively: ten, twenty, thirty. So the first wire has 30 seeds (3 dozen seeds).
Answer: There are 3 dozen.
In the second rope, there are segments, each segment has 10 seeds. Parents and children can count: ten, twenty, thirty, forty, fifty. 50, also known as 5 dozen.
Answer: There are 5 dozen seeds.
As the child has been divided above, the content of the 1 -dozen math lesson and the unit is very important. To help your child understand the lesson easily, parents try:
Prepare practical tools before learning: For example, parents should prepare a stick, marbles, a plate for children to practice counting and identifying dozens, units when coming to that knowledge.
Take examples associated with reality: Parents do not take distant examples but start from daily contact objects such as pencils, erasers, puzzle cubes … to make it easier for them to imagine when studying.
Instruct me to think each exercise: Do not let me know the answer quickly because so I will be more lazy to think more than that! Before each exercise, parents let me read loudly and clearly the requirements of the lesson and ask me how I will do it to solve the problem. In case the child has not found a solution, parents gently suggest the way of thinking and then model a lesson and let their children practice the same articles.
Accompanying and encouraging children: Children always need encouragement and encouragement from parents. That helps children to be more motivated and excited in learning. If you do well, parents reward simple gifts and if you do wrong, do not rush to scold, gently encourage your child to calmly review and do the homework.
With the information shared above, surely parents and children have understood more about the 1 -dozen math and the unit, right? Do not forget to share the article and click “Receive updates” to read the new and fastest sharing information every week from Shining Home – Gia đình Anh Ngữ!
Nguồn: https://www.ckconitsha.com/vn/ Tác giả: Nguyễn Lân dũng
Giáo sư Nguyễn Lân Dũng là một nhà khoa học tiêu biểu của Việt Nam trong lĩnh vực vi sinh vật học, với hơn nửa thế kỷ gắn bó với công tác giảng dạy và nghiên cứu (). Ông sinh trưởng trong một gia đình có truyền thống hiếu học, là con trai của Nhà giáo Nhân dân Nguyễn Lân. Trong suốt sự nghiệp, Giáo sư đã đảm nhận nhiều vai trò quan trọng như Chủ tịch Hội các ngành Sinh học Việt Nam, Đại biểu Quốc hội và được vinh danh với danh hiệu Nhà giáo Nhân dân vào năm 2010.
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