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Decimals: comparing place values | Decimals | Pre-Algebra | Khan Academy

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- [Instructor] So we have four numbers listed here, and what I would like you to do is get out some pencil and paper and pause this video and see if you can order these numbers from least to greatest. So the least would be at the left, and then keep going greater, and greater, and greater until you get to the greatest number. So pause the video and have a go at that. All right, now let's tackle this together. And the way that I like to do it is I start at the, I guess you could say, the most significant place value or the largest place value, compare the numbers. And then keep moving to the right to smaller and smaller place values. So we can start in the ones place. This number has zero ones, this number has zero ones, this number has zero ones, and that number has zero ones. So the ones place really doesn't help us much. But then we can move to the tenths place. This number has 7/10. This number has 0/10, so just from that we know that the second number is less than the first number. This has 7/10, this has 0/10. It doesn't matter what's happening in the places after that, to the right of that. This number over here also has 7/10, just like the first number. And this last number also has 7/10. So we know from comparing the ones and then the tenths place is that this number right over here is the smallest of the four numbers. They all have zero ones, but this one also has 0/10. So I'll list that here, 0.074. Now let's move to the hundredths place. So this number has 0/100. We've already used this number. This number has 7/100. And then this number, it might not be obvious, but the hundredths place you can view as being zero, the hundredths place, you can just put a zero there and not change the value. So this also has 0/100. So these three numbers, same ones, same tenths, but this number, 0.77, has 7/100, while the other two had 0/100. So this is going to be the largest of our four numbers. This is larger than these other two because of what we see in the hundredths place. It doesn't matter what's happening in the thousandths place or anything beyond that. So we put the 0.77 right over there. And now we are tasked, and we've used this number, and now we have to compare these two numbers, which were equal in the ones, tenths, and hundredths place, so we have to go to the thousandths place. This number has 7/1000. This number has 0/1000. So this number is smaller than this first number here. So I'll write this next, 0.7, and then the third smallest, or the next to largest number is this one over here, 0.707, and we're done. So the main idea is you wanna compare the most significant place values, the largest places values first, and then based on that, keep moving to the right to compare less and less significant place values.

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Ordering decimals through thousandths (video) | Khan Academy

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Instructor] So we have four numbers listed here, and what I would like you to do is get out some pencil and paper and pause this video and see if you can order these numbers from least to greatest.

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password: coldrock5

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Scholastic DynaMath | The Math & Literacy Magazine for Grades 3- 5

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Boost math and reading skills with ONE irresistible magazine! Scholastic DynaMath features math-based nonfiction, motivating practice problems, and a whole lot more!

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password: coldrock5

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Scholastic DynaMath | The Math & Literacy Magazine for Grades 3- 5

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Boost math and reading skills with ONE irresistible magazine! Scholastic DynaMath features math-based nonfiction, motivating practice problems, and a whole lot more!

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Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

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Khan Academy- Adding mixed numbers with unlike denominators   

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Khan Academy- Adding mixed numbers with unlike denominators   

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Adding Mixed Numbers with Unlike Denominators

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Pre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway. You're the airplane and algebra is your sunny vacation destination. Without the runway you're not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We're about to take off!

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Adding mixed numbers with unlike denominators | Fractions | Pre-Algebra | Khan Academy

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Adding Mixed Numbers with Unlike Denominators Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/fracti...

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Khan Academy: Adding mixed numbers with regrouping  

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Khan Academy: Adding mixed numbers with regrouping  

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Math Antics – Subtracting Mixed Numbers  

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Math Antics – Subtracting Mixed Numbers  

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Learn More at mathantics.com Visit http://www.mathantics.com for Free math videos and additional subscription based content!

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Khan Academy: How to subtract mixed numbers that have unlike denominators  

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Khan Academy: How to subtract mixed numbers that have unlike denominators  

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Learn how to subtract 3 and 2/5 from 7 and 6/9.

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-...

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Pre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway. You're the airplane and algebra is your sunny vacation destination. Without the runway you're not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We're about to take off!

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

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How to subtract mixed numbers that have unlike denominators | Fractions | Pre-Algebra | Khan Academy

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Learn how to subtract 3 and 2/5 from 7 and 6/9. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/frac...

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Khan Academy: Subtracting mixed numbers with regrouping  

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Khan Academy: Subtracting mixed numbers with regrouping  

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Subtracting mixed numbers with regrouping

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Subtracting mixed numbers with regrouping

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Khan Academy Multiplying fractions & whole numbers

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Khan Academy Multiplying fractions & whole numbers

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Multiplying fractions and whole numbers (video) | Khan Academy

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EdPuzzle Finding a Fraction of a Whole Number        

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EdPuzzle Finding a Fraction of a Whole Number        

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Finding a Fraction of a Whole Number (Non-Unit Fractions)

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Easily create beautiful interactive video lessons for your students you can integrate right into your LMS. Track students' progress with hassle-free analytics as you flip your classroom!

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Khan Academy Multiplying Fractions by Fractions 

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Khan Academy Multiplying Fractions by Fractions 

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Let's think about what it means to multiply 2 over 3, or 2/3, times 4/5. In a previous video, we've already seen how we can actually compute this. This is going to be equal to-- in the numerator, we just multiply the numerators. So it's going to be 2 times 4. And in the denominator, we just multiply the denominator. So it's going to be 3 times 5. And so the numerator is going to be 8, and the denominator is going to be 15. And this is about as simple as we can make it. 8 and 15 don't have any factors common to each other, than 1, so this is what it is. It's 8/15. But how, why does that actually makes sense? And to think about it, we'll think of two ways of visualizing it. So let's draw 2/3. I'll draw it relatively big. So I'm going to draw 2/3, and I'm going to take 4/5 of it. So 2/3, and I'm going to make it pretty big. Just like this. So this is 1/3. And then this would be 2/3. Which I could do a little bit better job making those equal, or at least closer to looking equal. So there you go. I have thirds. Let me do it one more time. So here I have drawn thirds. 2/3 represents 2 of them. It represents 2 of them. One way to think about this is 2/3 times 4/5 is 4/5 of this 2/3. So how do we divide this 2/3 into fifths? Well, what if we divided each of these sections into 5. So let's do that. So let's divide each into 5. 1, 2, 3, 4, 5. 1, 2, 3, 4, 5. And I could even divide this into 5 if I want. 1, 2, 3, 4, 5. And we want to take 4/5 of this section here. So how many fifths do we have here? We have 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. And we've got to be careful. These really aren't fifths. These are actually 15ths, because the whole is this thing over here. So I should really say how many 15ths do we have? And that's where we get this number from. But you see if 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15. Where did that come from? I had 3, I had thirds. And then I took each of those thirds, and I split them into fifths. So then I have five times as many sections. 3 times 5 is 15. But now we want 4/5 of this right over here. This is 10/15 right over here. Notice it's the same thing as 2/3. Now if we want to take 4/5 of that, if you have 10 of something, that's going to be 8 of them. So we're going to take 8 of them. So 1, 2, 3, 4, 5, 6, 7, 8. We took 8 of the 15, so that is 8/15. You could have thought about it the other way around. You could have started with fifths. So let me draw it that way. So let me draw a whole. So this is a whole. Let me cut it into five equal pieces, or as close as I can draw five equal pieces. 1, 2, 3, 4, 5. 4/5, we're going to shade in 4 of them. 4 of the 5 equal pieces. 3, 4. And now we want to take 2/3 of that. Well, how can we do that? Well, let's split each of these 5 into 3 pieces. So now we have essentially 15ths again. So 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15. We want to take 2/3 of this yellow area. We're not taking 2/3 of the whole section. We're taking 2/3 of the 4/5. So how many 15ths do we have here? We have 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12. So if you have 12 of something, and you want to take 2/3 of that, you're going to be taking 8 of it. So you're going to be taking 1, 2, 3, 4, 5, 6, 7, 8 or 8 of the fifteenths now. So either way, you get to the same result. One way, you're thinking of taking 4/5 of 2/3. Another way you could think of it as you're taking 2/3 of 4/5.

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Intro to multiplying 2 fractions (video) | Khan Academy

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Let's think about what it means to multiply 2 over 3, or 2/3, times 4/5. In a previous video, we've already seen how we can actually compute this. This is going to be equal to-- in the numerator, we just multiply the numerators. So it's going to be 2 times 4.

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Learn how to multiply fractions with Mr. J! This video will specifically cover multiplying fractions by fractions.

Whether you're just starting out, or need a quick refresher, this is the video for you if you're looking for help with multiplying fractions. Mr. J will go through multiplying fractions examples and explain the steps of multiplying fractions.

About Math with Mr. J: This channel offers instructional videos and mastery checks (practice videos to gauge understanding) that are directly aligned with math standards (3rd grade, 4th grade, 5th grade, etc.). Videos can be used to introduce content, reteach content, or as a study tool. All material is absolutely free.

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Hopefully this video is what you're looking for when it comes to help with multiplying fractions!

This video is for you if you're looking for help with:
-multiplying fractions
-how to multiply fractions
-fraction by fraction multiplication
-how to multiply a fraction by another fraction
-fraction help

Have a great rest of your day and thanks again for watching!

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Multiplying Fractions by Fractions | How to Multiply Fractions | 5th Grade Math

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Learn how to multiply fractions with Mr. J! This video will specifically cover multiplying fractions by fractions. Whether you're just starting out, or need ...

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Multiplying Fractions Examples for Building Number Sense 

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Multiplying Fractions Examples for Building Number Sense 

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Multiplying Fractions Examples for Building Number Sense!

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Khan Academy Video: Visualizing Multiplying Fractions

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Khan Academy Video: Visualizing Multiplying Fractions

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Multiplying fractions: visualizing | Fractions | 5th grade | Khan Academy

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 Multiply Fractions by Fractions Using an AreaModel

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 Multiply Fractions by Fractions Using an AreaModel

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Multiply Fractions by Fractions Area Model

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Multiply a fraction by fraction using an area model

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Multiply a fraction by fraction using an area model

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Multiply a fraction by fraction using an area model #2

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Khan Academy Video: Multiplying fractions word problems

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Khan Academy Video: Multiplying fractions word problems

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Multiplying fractions word problem: milk love | Fractions | Pre-Algebra | Khan Academy

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Multiplying Fractions Word Problems | Fraction Word Problems

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Khan Academy video: Understanding division of fractions

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Khan Academy video: Understanding division of fractions

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Understanding division of fractions | Fractions | Pre-Algebra | Khan Academy

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Dividing whole numbers and fractions: t-shirts | Fractions | Pre-Algebra | Khan Academy