What do you do when there's half of an object?

When there's only half an object, it means that only half the "units" are being represented. For example, in this video, half a blood drop would mean 4 people because a whole drop means 8.

How does "●" symbolise multiplication?

The Reason Why The Dot Is A Sign Of Multiplication( Simplified Reason) is to avoid confusion between variables.. For example 9 x (X=30) In This Problem , The problem solvers may get confused with the two X's , so to fix this situation mathematicians have resolved to using a dot as a sign of multiplication . Your Welcome :D

Why do we divide by 2 when there is half an object ?

Half of a picture tells us that the picture represents half of the value of the regular sized picture. In the video example, if there was half a drop of blood it would represent 4 people, we get this by dividing the regular value of 8 people per drop of blood by 2. If there ever is a quarter or a third of a picture you would also divide to find out what value they were as but you would divide by 4 and 3 to find out the value.

what to do if a question said one drip = 3 people but there is half a drip

Hi, you can divide the 3 by 2 which gives 1.5 in this case

I know this is not that related to the video but shouldn't there be more o neg because o o neg the common blood type sorry if I have bad grammar I am a fifth grader and I really doubt that no one an will look back at this thing because it is old and I am older do that doesn't matter

Hi. O is the most common blood type. But most of those are O positive. O negative is rarer. Only about 7 percent of the population have O negative.

idk, maybe you're good at probability

What is the age I am supposed to be doing this course at

i mean, i'm almost a junior in high school and we just started this unit, but I also remember doing this in 6th grade as well.

How are pictographs used in real life?

Hey Marvin! Pictographs are useful for visualizing lots of information in an easy way. I took this example from wikipedia's page on pictographs, which pictures the casualties of the accident involving RMS Titanic (Pretty tragic, but pretty accurate too!) http://upload.wikimedia.org/wikipedia/commons/thumb/6/69/Titanic_casualties.svg/512px-Titanic_casualties.svg.png

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Class 8 Math (Assamese)

Course: Class 8 Math (Assamese) > Unit 4

Lesson 1: Reading Pictograph

Reading pictographs

Name: Reading pictographs
Uploaded: 2011-11-15T11:00:32Z
Description: Common sense tells you that a pictograph must be some kind of....picture. Yes! A pictograph is basically a way to represent data with pictures that relate to the data. Let's look at this word problem that asks to interpret a pictograph.

Google Classroom

Common sense tells you that a pictograph must be some kind of....picture. Yes! A pictograph is basically a way to represent data with pictures that relate to the data. Let's look at this word problem that asks to interpret a pictograph. Created by Sal Khan and Monterey Institute for Technology and Education.

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Celia.Lewis
Posted 11 years ago. Direct link to Celia.Lewis's post “What do you do when there...”
What do you do when there's half of an object?
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(157 votes)
Answer
- krystinaatownsend
  Posted 11 years ago. Direct link to krystinaatownsend's post “When there's only half an...”
  When there's only half an object, it means that only half the "units" are being represented. For example, in this video, half a blood drop would mean 4 people because a whole drop means 8.
  Comment on krystinaatownsend's post “When there's only half an...”
  (86 votes)
Christine Fafunso
Posted 11 years ago. Direct link to Christine Fafunso's post “How does "●" symbolise mu...”
How does "●" symbolise multiplication?
Button navigates to signup pageComment on Christine Fafunso's post “How does "●" symbolise mu...”
(49 votes)
Answer
- Adam Smadi
  Posted 10 years ago. Direct link to Adam Smadi's post “The Reason Why The Dot Is...”
  The Reason Why The Dot Is A Sign Of Multiplication( Simplified Reason) is to avoid confusion between variables.. For example
  9 x (X=30)
  In This Problem , The problem solvers may get confused with the two X's , so to fix this situation mathematicians have resolved to using a dot as a sign of multiplication . Your Welcome :D
  Button navigates to signup page
  (15 votes)
Vong, Elaine(伊莱恩)
Posted 9 years ago. Direct link to Vong, Elaine(伊莱恩)'s post “Why do we divide by 2 whe...”
Why do we divide by 2 when there is half an object ?
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(5 votes)
Answer
- Dylan Taylor
  Posted 8 years ago. Direct link to Dylan Taylor's post “Half of a picture tells u...”
  Half of a picture tells us that the picture represents half of the value of the regular sized picture. In the video example, if there was half a drop of blood it would represent 4 people, we get this by dividing the regular value of 8 people per drop of blood by 2. If there ever is a quarter or a third of a picture you would also divide to find out what value they were as but you would divide by 4 and 3 to find out the value.
  Button navigates to signup page
  (6 votes)
Keenyn bradley
Posted 9 years ago. Direct link to Keenyn bradley's post “what to do if a question ...”
what to do if a question said one drip = 3 people but there is half a drip
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(5 votes)
Answer
- Vijval
  Posted 3 years ago. Direct link to Vijval's post “Hi, you can divide the 3 ...”
  Hi, you can divide the 3 by 2 which gives 1.5 in this case
  Button navigates to signup page
  (4 votes)
aqsyed
Posted 5 years ago. Direct link to aqsyed's post “I know this is not that r...”
I know this is not that related to the video but shouldn't there be more o neg because o o neg the common blood type sorry if I have bad grammar I am a fifth grader and I really doubt that no one an will look back at this thing because it is old and I am older do that doesn't matter
Button navigates to signup pageComment on aqsyed's post “I know this is not that r...”
(5 votes)
Answer
- fr33d0g
  Posted 5 years ago. Direct link to fr33d0g's post “Hi. O is the most common ...”
  Hi. O is the most common blood type. But most of those are O positive. O negative is rarer. Only about 7 percent of the population have O negative.
  Comment on fr33d0g's post “Hi. O is the most common ...”
  (4 votes)
Noah
Posted 5 months ago. Direct link to Noah's post “why is this so easy”
why is this so easy
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(2 votes)
Answer
- Lunar
  Posted a month ago. Direct link to Lunar's post “idk, maybe you're good at...”
  idk, maybe you're good at probability
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  (3 votes)
LucyW
Posted 2 months ago. Direct link to LucyW's post “What is the age I am supp...”
What is the age I am supposed to be doing this course at
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(2 votes)
Answer
- Lunar
  Posted a month ago. Direct link to Lunar's post “i mean, i'm almost a juni...”
  i mean, i'm almost a junior in high school and we just started this unit, but I also remember doing this in 6th grade as well.
  Comment on Lunar's post “i mean, i'm almost a juni...”
  (2 votes)
Marvin Cohen
Posted 9 years ago. Direct link to Marvin Cohen's post “How are pictographs used ...”
How are pictographs used in real life?
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(2 votes)
Answer
- Arthur Lorente
  Posted 9 years ago. Direct link to Arthur Lorente's post “Hey Marvin! Pictographs a...”
  Hey Marvin! Pictographs are useful for visualizing lots of information in an easy way. I took this example from wikipedia's page on pictographs, which pictures the casualties of the accident involving RMS Titanic (Pretty tragic, but pretty accurate too!) http://upload.wikimedia.org/wikipedia/commons/thumb/6/69/Titanic_casualties.svg/512px-Titanic_casualties.svg.png
  Comment on Arthur Lorente's post “Hey Marvin! Pictographs a...”
  (2 votes)
tessa.s.denton
Posted 9 years ago. Direct link to tessa.s.denton's post “i dont get why it has add...”
i dont get why it has adding than subtract why cant you just put like the numbers
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(2 votes)
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Clarinda
Posted 7 years ago. Direct link to Clarinda's post “Where would pictographs b...”
Where would pictographs be used in real life?
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(2 votes)
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- Ben
  Posted 6 years ago. Direct link to Ben's post “in some jobs you use pict...”
  in some jobs you use pictographs, diagrams and tables. Like for example,if you want to work in a company, then you'll have to make a diagram/graph of how much you sell your products in the past 3 months.
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  (1 vote)

Video transcript

According to the pictograph below, how many survey respondents have type O positive blood? How many have O negative blood? So a pictograph is really just a way of representing data with pictures that are somehow related to the data. So in this case, they gave us little pictures of, I'm assuming, blood drops right over here. And then they tell us that each blood drop in this pictograph represents 8 people. So you could kind of view that as a scale of these graphs. Each of these say 8 people. So, for example, if you say how many people have A positive? It would be 1, 2, 3, 4, 5, 6, 7 blood drops. But each of those blood drops represent 8 people, so it would be 56 people have type A positive. But let's answer the actual question that they're asking us. How many survey respondents have type O positive? So this is O, and then we care about O positive. So we have 1 blood drop, 2, 3. I'm going to do this in a new, different color. We have 1, 2, 3, 4, 5, 6, 7, 8. So we have 8 drops. I'll put those in quotes because they're pictures of drops. And then the scale is 8 people. Let me write it this way. Times 8 people per drop. And so 8 times 8-- and actually even the drops, you could view them as canceling out if you view them as units, so drops, drops. 8 times 8 is equal to 64 people. So they could have written literally the number 64 right over here. 64 people have type O positive blood. Now let's think about the O negative case, O negative blood. Well, this is O. And then within the blood group O, this is O negative. And we have 1 drops, 2 drops. So we have 2 drops times 8 people per drop. And so 2 times 8, each of these represent 8. So 8 and then 16, or 2 times 8 is equal to 16 people. So 16 of the survey respondents, 16 have type O negative. 64 have type O positive.