Pratica di Shadowing: Math Antics - Percents Missing Total - Impara a parlare inglese con i video

Creazione lezione...
1
Hi! Welcome to Math Antics. In our last lesson about percents, we learned that there’re three main types of percent problems because there’s three different numbers that could be missing.
2
Those three numbers are the ‘part’, the ‘total’, and the ‘percent’.
3
They’re just the three variable in the percentage equation.
4
The forth number is always 100, since that’s what percent means: per 100.
5
In the last two videos, we learned how to solve problems where the ‘part’ was unknown and where the ‘percent’ was unknown.
6
In this video, we’re gonna learn how to solve problems where the ‘total’ is unknown or missing.
7
With this type of problem, you’ll be told what the percent is, and you’ll be told what part of the total you have.
8
But you’ll need to figure out what that total itself is.
9
Here’s an example of a problem like that: Your friend has a bag of marbles, and he tells you that 20% of the marbles are red.
10
If there’s 7 red marbles, how many marbles does he have altogether?
11
Okay, so how do you know that it’s the total that’s missing in this problem?
12
Well, the word “altogether” is a big clue because it means almost the same thing as “total”.
13
So, if the question has words like, “altogether”, or “in all”, or “total”, or “whole”, or “entire” those can help you know that you need to find the total.
14
And another way that we can tell is by the numbers that we ARE given.
15
In this problem, we know that the percent is 20, and we’re also told that PART of the marbles are red, so we know that the PART is 7.
16
So that means that it must be the total that’s missing!
17
Alright then, so how do we figure out what the total is?
18
Well, using a little algebra we can re-arrange our percent equation like this: What this new form of the equation tells us is that, if we take the ‘part’ and multiply it by 100, and then we divide that by the ‘percent’, we’ll get the ‘total’.
19
That seems simple enough. It’s just two steps!
20
Let’s try it out on our word problem about the marbles.
21
We know that the ‘part’ is 7, so step one is to just multiply that part by 100.
22
7 × 100 is 700.
23
And in step two, we take that 700 and divide it by the ‘percent’, which we’re told is 20.
24
Okay, 700 divided by 20…. hmmm….
25
Well, we could use a calculator to divide, but this doesn’t seem too hard, so I’ll just do the division the long way.
26
20 is to big to divide into the first digit so we’ll need to include the digit next to it as well.
27
Now we ask, “How many ’20’s does it take to make 70 or almost 70”.
28
That would be 3 because 3 × 20 is 60.
29
70 minus 60 leaves 10 as the remainder.
30
And then we bring down the zero and then we ask, “How many ’20’s will divide into 100?” Ah-ha… 5, because 5 × 20 is 100, so that leaves no remainder.
31
So 700 divided by 20 is 35.
32
And that means that the total number of marbles is 35.
33
And in a problem like this, you can always check your answer by making sure that the fraction of the ‘part’ over the ‘total’ would give you the correct percent.
34
For example, in this case, you could make sure that the fraction 7 over 35 would really be 20%.
35
Now that wasn’t so tough, was it?
36
Let’s see one more example to make sure you’ve got the procedure down before you try some on your own.
37
The next problem says: A high school marching band has 12 flute players.
38
If 8% of the band members play the flute, then how many members are in the entire band?
39
Okay, so the smaller ‘part’ in this problem is 12 since there’s 12 flute players.
40
And we’re told that they make up 8 percent of the band, so the ‘percent’ is 8.
41
Again, it’s the ‘total’ that’s missing, and to find it, we just need to follow our 2-step procedure.
42
For step one, we multiply the ‘part’ by 100: 12 × 100 = 1,200 For step two, we divide that 1,200 by the percent, which is 8.
43
1,200 divided by 8 equals 150.
44
Great… that means that the total number of band members is 150.
45
And again, you can always check your answer the way we did in the last example.
46
Alright… that does it for this lesson.
47
Remember… the key to getting really good at math is to do it yourself.
48
Doing practice problems on your own will help you become a great problem solver.
49
Good luck! Thanks for watching Math Antics and I’ll see ya next time.
50
Learn more at www.mathantics.com
📺 Stesso Canale
Math Antics - Negative NumbersB1
3

Math Antics - Negative Numbers

American AccentKidsTeensHigh School Students
Extras ArcLength YouTubeB2

Extras ArcLength YouTube

American AccentHigh School StudentsUniversity Students
Math Antics - Finding A Percent Of A NumberB1

Math Antics - Finding A Percent Of A Number

American AccentKidsTeensHigh School Students
Math Antics - Calculating Percent ChangeB1

Math Antics - Calculating Percent Change

American AccentBusiness EnglishHigh School StudentsUniversity Students
Math Antics - What Percent Is It?B1

Math Antics - What Percent Is It?

American AccentDaily ConversationHigh School StudentsUniversity Students
Math Antics - Percents And Equivalent FractionsB1

Math Antics - Percents And Equivalent Fractions

American AccentDaily ConversationHigh School StudentsUniversity Students
Math Antics - What Are Percentages?B1

Math Antics - What Are Percentages?

American AccentHigh School StudentsUniversity Students
✨ Video consigliato
AEE - Does This Content Make You Feel Content?B1
1
246 frasi

AEE - Does This Content Make You Feel Content?

American AccentBusiness EnglishDaily ConversationHigh School Students
FractionsB1
57 frasi

Fractions

American AccentHigh School StudentsUniversity Students
Elements | Middle school chemistry | Khan AcademyB1
2
74 frasi

Elements | Middle school chemistry | Khan Academy

American AccentHigh School StudentsUniversity Students
Academy Anecdotes (School Stories)B1
2
127 frasi

Academy Anecdotes (School Stories)

American AccentTeensDaily ConversationHigh School Students
B1 English Listening Practice - TippingB1
38
62 frasi

B1 English Listening Practice - Tipping

American AccentTravel EnglishTeensDaily Conversation
Miss The PointA2
2
10 frasi

Miss The Point

American AccentTeensDaily ConversationHigh School Students
Subtracting FractionsB1
125 frasi

Subtracting Fractions

American AccentHigh School StudentsUniversity Students
Composite Area Example 1B1
1
33 frasi

Composite Area Example 1

High School StudentsUniversity Students
Crime and Criminals 🕵️‍♂️ English Learning Animated Videos for SchoolsB1
1
15 frasi

Crime and Criminals 🕵️‍♂️ English Learning Animated Videos for Schools

Daily ConversationHigh School StudentsUniversity Students
STOP Making These CRINGE English MistakesB1
2
258 frasi

STOP Making These CRINGE English Mistakes

American AccentBusiness EnglishDaily ConversationHigh School Students

Perché praticare la conversazione con questo video?

Praticare la conversazione in inglese è fondamentale per migliorare la propria fluidità e comprensione. Il video "Math Antics - Percents Missing Total" offre un contesto unico, integrando i temi matematici con l'apprendimento della lingua. Attraverso la spiegazione di problemi percentuali, avrai l'opportunità di assistere a un linguaggio chiaro e accessibile, ideale per la pratica di conversazione in inglese. Utilizzando tecniche come il shadow speak, potrai imitare la pronuncia e le intonazioni dell'oratore, rendendo l'apprendimento più interattivo e coinvolgente. Non solo migliorerai la tua capacità di affrontare materie matematiche in inglese, ma acquisirai anche sicurezza nel parlare quotidianamente.

Grammatica ed espressioni nel contesto

Nel video, ci sono diverse strutture grammaticali ed espressioni chiave che possono aiutarti a comprendere meglio l'inglese. Ecco alcune di esse:

  • Percent of: Utilizzato per esprimere una parte rispetto al totale, come in "20% of the marbles are red". Questa struttura è frequentemente usata nei contesti di calcolo e percentuali.
  • How many: Questa domanda è fondamentale per formulare interrogativi, ad esempio "How many marbles does he have altogether?" Insegnando a chiedere informazioni specifiche.
  • Telling the difference: Espressioni come "in all", "total", e "altogether" aiutano a identificare il contesto necessario per risolvere i problemi percentuali e possono essere applicate in conversazioni quotidiane.

Queste strutture migliorano il tuo shadowing in inglese, permettendoti di padroneggiare frasi comuni e la loro pronuncia.

Trappole di pronuncia comuni

Durante la visione del video, ci sono alcune parole e frasi che possono risultare difficili da pronunciare. Ecco alcune trappole di pronuncia da tenere a mente:

  • Percent: Assicurati di pronunciare correttamente questa parola, ponendo attenzione all'accento e alla lunghezza delle vocali.
  • Alto-gether: Spesso trascurata, la pronuncia corretta di "altogether" è fondamentale per farsi capire in contesti di conversazione.
  • Division: Quando parli di divisione, lavora sulla fluidità della tua pronuncia per evitare pause inappropriate.

Con il shadow speak, puoi esercitarti a ripetere correttamente queste parole, migliorando così la tua schiettezza e sicurezza nella comunicazione. Ricorda che imparare l'inglese con youtube può essere un ottimo modo per aumentare la tua esposizione a diverse pronunce e accenti!

Cos'è la tecnica dello Shadowing?

Shadowing è una tecnica di apprendimento delle lingue supportata da studi scientifici, originariamente sviluppata per la formazione dei traduttori professionisti e resa popolare dal poliglotta Dr. Alexander Arguelles. Il metodo è semplice ma potente: ascolti un audio in inglese di madrelingua e lo ripeti immediatamente ad alta voce — come un'ombra che segue il parlante con un ritardo di solo 1–2 secondi. A differenza dell'ascolto passivo o degli esercizi di grammatica, lo shadowing costringe il tuo cervello e i muscoli della bocca a elaborare e riprodurre simultaneamente i modelli di discorso reale. La ricerca dimostra che migliora significativamente la precisione della pronuncia, l'intonazione, il ritmo, il discorso connesso, la comprensione dell'ascolto e la fluidità del parlato — rendendolo uno dei metodi più efficaci per la preparazione alla prova di speaking dell'IELTS e per la comunicazione reale in inglese.

Tecnica dello shadowing: leggi la guida completa passo dopo passo →