11,12,13,14,15,16,17,18 je mets mon 18 et enfin en haut : 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20 je mets mon 20. Maintenant, on va faire la multiplication. On va prendre le nombre en bas, qui est le 8, et on va le multiplier par chaque nombre dans le premier secteur. Donc, 8 x 1 = 8, 8 x 2 = 16, 8 x 3 = 24, et ainsi de suite jusqu'à 8 x 20 = 160. Ensuite, on fait la même chose avec le nombre au milieu, qui est le 18, et on le multiplie par chaque nombre dans le deuxième secteur. Donc, 18 x 1 = 18, 18 x 2 = 36, 18 x 3 = 54, et ainsi de suite jusqu'à 18 x 20 = 360. Enfin, on prend le nombre en haut, qui est le 20, et on le multiplie par chaque nombre dans le troisième secteur. Donc, 20 x 1 = 20, 20 x 2 = 40, 20 x 3 = 60, et ainsi de suite jusqu'à 20 x 20 = 400. Maintenant, on va additionner tous ces résultats pour trouver la réponse finale. Donc, 8 + 16 + 24 + ... + 160 + 18 + 36 + 54 + ... + 360 + 20 + 40 + 60 + ... + 400 = réponse finale. Cela peut sembler un peu compliqué, mais avec de la pratique, on peut rapidement faire des multiplications avec facilité.

11,12,13,14,15,16,17,18 je mets mon 18 et enfin en haut : 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20 je mets mon 20. Maintenant, on va faire la multiplication. On va prendre le nombre en bas, qui est le 8, et on va le multiplier par chaque nombre dans le premier secteur. Donc, 8 x 1 = 8, 8 x 2 = 16, 8 x 3 = 24, et ainsi de suite jusqu'à 8 x 20 = 160. Ensuite, on fait la même chose avec le nombre au milieu, qui est le 18, et on le multiplie par chaque nombre dans le deuxième secteur. Donc, 18 x 1 = 18, 18 x 2 = 36, 18 x 3 = 54, et ainsi de suite jusqu'à 18 x 20 = 360. Enfin, on prend le nombre en haut, qui est le 20, et on le multiplie par chaque nombre dans le troisième secteur. Donc, 20 x 1 = 20, 20 x 2 = 40, 20 x 3 = 60, et ainsi de suite jusqu'à 20 x 20 = 400. Maintenant, on va additionner tous ces résultats pour trouver la réponse finale. Donc, 8 + 16 + 24 + ... + 160 + 18 + 36 + 54 + ... + 360 + 20 + 40 + 60 + ... + 400 = réponse finale. Cela peut sembler un peu compliqué, mais avec de la pratique, on peut rapidement faire des multiplications avec facilité.

In today's digital age, where calculators and computers are readily available, the skill of manual multiplication may seem outdated. However, there are still many benefits to learning and practicing this skill. From improving mental math abilities to fostering a deeper understanding of mathematical concepts, manual multiplication can be a valuable tool for both students and adults alike.

One popular method of manual multiplication is the use of grids or arrays. In a YouTube video titled "Comment faire une multiplication avec un dessin," the presenter demonstrates how to use a grid to solve multiplication problems. The video starts by drawing a grid with three sectors: the bottom sector with the number 8, the middle sector with the number 18, and the top sector with the number 20. The presenter then proceeds to multiply each number in the sectors and add the results to find the final answer.

This method of using grids or arrays can be particularly helpful for visual learners. By representing the numbers in a visual format, it becomes easier to understand the concept of multiplication and visualize the steps involved. Additionally, the use of grids can also aid in organizing and keeping track of calculations, especially when dealing with larger numbers.

However, manual multiplication is not just limited to grids and arrays. There are various other techniques and strategies that can be employed to solve multiplication problems efficiently. For example, the "distributive property" can be used to break down a multiplication problem into smaller, more manageable parts. By distributing the multiplication across different terms, complex calculations can be simplified and solved step by step.

Another technique that can be useful is the "multiplying by powers of 10." This method involves shifting the decimal point in a number to the right or left depending on the power of 10 being multiplied. This technique can be particularly helpful when dealing with decimal numbers or when multiplying by multiples of 10.

Incorporating these manual multiplication techniques into daily practice can have significant benefits. Not only does it improve mental math skills, but it also enhances problem-solving abilities and critical thinking. Moreover, manual multiplication allows individuals to have a deeper understanding of the mathematical concepts behind multiplication, which can be beneficial in various academic and professional settings.

In conclusion, while calculators and computers may make manual multiplication seem unnecessary, the skill itself holds several advantages. From improving mental math abilities to fostering a deeper understanding of mathematical concepts, manual multiplication can be a valuable tool for individuals of all ages. By incorporating techniques such as grids, arrays, the distributive property, and multiplying by powers of 10, individuals can enhance their mathematical skills and problem-solving abilities. So, why not dust off the pen and paper and give manual multiplication a try? You might be surprised at the benefits it brings.

Actionable Advice:

1. Practice manual multiplication regularly: Set aside some time each day to practice manual multiplication using different techniques such as grids, arrays, and the distributive property. This consistent practice will help improve your skills and speed.
2. Challenge yourself with larger numbers: As you become more comfortable with manual multiplication, gradually increase the complexity of the numbers you work with. This will help build your confidence and ability to handle more challenging calculations.
3. Explore alternative methods: Don't limit yourself to just one technique. Experiment with different methods such as multiplying by powers of 10 or breaking down numbers into smaller parts. Find what works best for you and incorporate it into your manual multiplication practice.