System: You are a JSON assistant. You only reply in valid JSON and never in normal text. Proporcione una calificaci�n de dificultad para la informaci�n del video detallada a continuaci�n. Me gustar�a una �nica propiedad llamada "result" que contenga un valor de punto flotante entre 0 y 1.
Las categor�as de puntuaci�n de dificultad son las siguientes:
0.0 - Principiante Absoluto: Este nivel presenta un lenguaje extremadamente simple y expresiones b�sicas, acompa�adas de visuales y contexto claros. Es perfecto para individuos sin conocimiento del idioma objetivo.
0.3 - Principiante: Este nivel incluye oraciones sencillas y palabras de uso com�n. El video puede ofrecer alg�n apoyo visual y contexto para ayudar en la comprensi�n.
0.5 - Intermedio: Este nivel presenta oraciones m�s intrincadas y un rango m�s amplio de vocabulario. Algunas frases idiom�ticas pueden estar incluidas, lo que requiere un poco m�s de comprensi�n previa.
0.6 - Intermedio Alto: Este nivel contiene vocabulario especializado y conceptos relacionados con campos espec�ficos. Los espectadores deben poseer una comprensi�n s�lida del idioma objetivo para una comprensi�n completa.
0.8 - Avanzado: Este nivel incorpora vocabulario sofisticado y estructuras de oraciones intrincadas. Puede presentar temas matizados que exigen un alto nivel de competencia en el idioma.
1 - Muy Avanzado: Este nivel est� dirigido a individuos fluidos, presentando lenguaje especializado y conceptos que pueden no ser ampliamente reconocidos por todos los hablantes nativos.
Assistant: Caption: Educational video for kids that talks about how to mentally add and subtract 9 in a quick and easy way.

When we need to add or subtract 9 to a two-digit number, instead of doing it longhand, which can take more time, we can use a very simple trick. 

For example, let's add 9 plus 12. To do this, the first thing we are going to do is add 10 to 12, which gives us 22. Then, we simply subtract 1, and we get 21 in total! 

This video is a very useful and interesting resource for children. This trick makes mental math easier and helps you to get the result faster. It is an excellent video for elementary school.

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Description: smile and learn Hello friends remember me I&#39;m back from Venus to show you some amazing tricks that will help you add and subtract really fast are you ready to become a mental math star today we&#39;ll learn how to add and subtract nine with a few little tricks here we [Music] go how many martians are there on two spaceships if there are 12 on one and nine on the other let&#39;s start by learning the trick to add nine quickly we&#39;re going to add 12 + 9 so first we&#39;re going to add 10 martians to the 12 on the other ship now we have 22 easy right next we subtract one from that number because we want to add N9 not 10 what is 22 - 1 exactly 21 so 12 + 9 = 21 there are 21 martians on the two ships don&#39;t forget this trick next time you have to add a nine first add 10 and then subtract one you may ask why am i counting martians well tomorrow is my birthday and I need to know how many of my friends are coming to my party it&#39;s going to be out of this world oh no oh look a meteorite watch out we had 32 ships until the meteorite came and hit nine of them so how many ships do we have left let&#39;s learn how to quickly subtract nine from a number we had 32 ships which means we want to subtract nine that are broken we start by subtracting 32 - 10 that leaves us with 22 ships then we add one because we want to subtract nine not 10 now we have 23 ships let&#39;s hope we can fix them soon we need them to go on vacation to Jupiter let&#39;s put these tricks into practice together here we go if we want to add nine planets to 54 how many planets are there in total first we add 10 which gives us 64 and then we subtract one this gives us 63 if we subtract nine planets from 65 how many planets are there exactly 56 because as we talked about 65 - 10 is 55 + 1 is 56 Stellar now you know how to quickly add and subtract nine from a number don&#39;t forget these tricks they will save you a lot of time see you soon little math [Music] Stars we&#39;ve learned so much in just one video did you know there are many more videos imagine how much you could learn subscribe to the smile and learn educational channel to learn and have fun at the same time
Title: Adding and Subtracting 9 🤔 MENTAL MATH for Kids 🚀 Episode 4
Language: en
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