These videos show you examples of how to use the bar or block model in solving math word problems. The examples are all about 5th grade level. Enjoy! I hope they are of help!
First I solve the following word problem using a bar model (Singapore math style), taken from Math Mammoth grade 5 curriculum: Brenda and Lily shared the cost of a $11.70 lunch so that Brenda paid two times as much as Lily. Find their shares.
Next problem is this: One rake is $5.60 more than the other, and together they cost $22.70. How much does the cheaper rake cost?
And lastly, John spent 3/10 of his money, and had $45.57 left. How much did he have initially?
Showing posts with label Video. Show all posts
Showing posts with label Video. Show all posts
Saturday, June 25, 2011
Problem solving videos--bar/block model
These videos show you examples of how to use the bar or block model in solving math word problems. The examples are all about 5th grade level. Enjoy! I hope they are of help!
First I solve the following word problem using a bar model (Singapore math style), taken from Math Mammoth grade 5 curriculum: Brenda and Lily shared the cost of a $11.70 lunch so that Brenda paid two times as much as Lily. Find their shares.
Next problem is this: One rake is $5.60 more than the other, and together they cost $22.70. How much does the cheaper rake cost?
And lastly, John spent 3/10 of his money, and had $45.57 left. How much did he have initially?
First I solve the following word problem using a bar model (Singapore math style), taken from Math Mammoth grade 5 curriculum: Brenda and Lily shared the cost of a $11.70 lunch so that Brenda paid two times as much as Lily. Find their shares.
Next problem is this: One rake is $5.60 more than the other, and together they cost $22.70. How much does the cheaper rake cost?
And lastly, John spent 3/10 of his money, and had $45.57 left. How much did he have initially?
Friday, April 22, 2011
Decimals videos
Here are some of my recent additions to Math Mammoth Youtube channel.
- videos about decimal arithmetic.
Add and subtract decimals
I explain the main principle in adding or subtracting decimals: we can add or subtract "as if" there was no decimal point IF the decimals have the same kind of parts--either tenths, hundredths, or thousandths. Many students have a misconception of thinking of the "part" after the decimal point as "plain numbers." Such students will calculate 0.7 + 0.05 = 0.12, which is wrong, and I explain why in the video.
Multiply decimals by whole numbers
I explain how to multiply decimals by whole numbers: think of your decimal as so many "tenths", "hundredths", or "thousandths", and simply multiply as if there was no decimal point. Compare to multiplying so many "apples". For example, 5 x 0.06 is five copies of six "hundredths". Multiply 5 x 6 = 30. The answer has to be 30 hundredths (hundredths corresponding to apples), or 0.30, which simplifies to 0.3.
Divide decimals using mental math
I explain two basic situations where you can use mental math to divide decimals: 1) Think of "stuff" (which is tenths, hundredths, or thousandths) shared evenly between so many people; OR 2) Think how many times the divisor fits into the dividend.
Long division with decimals
When the dividend is a decimal, and the divisor is a whole number, long division is easy: just divide as if there was no decimal point, and then put a decimal point in the answer in the same place as it is in the dividend. I also show an example where we add decimal zeros to the dividend, in order to get an even division. Lastly I show how the fraction 3/7 is converted into a decimal using long division.
- videos about decimal arithmetic.
Add and subtract decimals
I explain the main principle in adding or subtracting decimals: we can add or subtract "as if" there was no decimal point IF the decimals have the same kind of parts--either tenths, hundredths, or thousandths. Many students have a misconception of thinking of the "part" after the decimal point as "plain numbers." Such students will calculate 0.7 + 0.05 = 0.12, which is wrong, and I explain why in the video.
Multiply decimals by whole numbers
I explain how to multiply decimals by whole numbers: think of your decimal as so many "tenths", "hundredths", or "thousandths", and simply multiply as if there was no decimal point. Compare to multiplying so many "apples". For example, 5 x 0.06 is five copies of six "hundredths". Multiply 5 x 6 = 30. The answer has to be 30 hundredths (hundredths corresponding to apples), or 0.30, which simplifies to 0.3.
Divide decimals using mental math
I explain two basic situations where you can use mental math to divide decimals: 1) Think of "stuff" (which is tenths, hundredths, or thousandths) shared evenly between so many people; OR 2) Think how many times the divisor fits into the dividend.
Long division with decimals
When the dividend is a decimal, and the divisor is a whole number, long division is easy: just divide as if there was no decimal point, and then put a decimal point in the answer in the same place as it is in the dividend. I also show an example where we add decimal zeros to the dividend, in order to get an even division. Lastly I show how the fraction 3/7 is converted into a decimal using long division.
Decimals videos
Here are some of my recent additions to Math Mammoth Youtube channel.
- videos about decimal arithmetic.
Add and subtract decimals
I explain the main principle in adding or subtracting decimals: we can add or subtract "as if" there was no decimal point IF the decimals have the same kind of parts--either tenths, hundredths, or thousandths. Many students have a misconception of thinking of the "part" after the decimal point as "plain numbers." Such students will calculate 0.7 + 0.05 = 0.12, which is wrong, and I explain why in the video.
Multiply decimals by whole numbers
I explain how to multiply decimals by whole numbers: think of your decimal as so many "tenths", "hundredths", or "thousandths", and simply multiply as if there was no decimal point. Compare to multiplying so many "apples". For example, 5 x 0.06 is five copies of six "hundredths". Multiply 5 x 6 = 30. The answer has to be 30 hundredths (hundredths corresponding to apples), or 0.30, which simplifies to 0.3.
Divide decimals using mental math
I explain two basic situations where you can use mental math to divide decimals: 1) Think of "stuff" (which is tenths, hundredths, or thousandths) shared evenly between so many people; OR 2) Think how many times the divisor fits into the dividend.
Long division with decimals
When the dividend is a decimal, and the divisor is a whole number, long division is easy: just divide as if there was no decimal point, and then put a decimal point in the answer in the same place as it is in the dividend. I also show an example where we add decimal zeros to the dividend, in order to get an even division. Lastly I show how the fraction 3/7 is converted into a decimal using long division.
- videos about decimal arithmetic.
Add and subtract decimals
I explain the main principle in adding or subtracting decimals: we can add or subtract "as if" there was no decimal point IF the decimals have the same kind of parts--either tenths, hundredths, or thousandths. Many students have a misconception of thinking of the "part" after the decimal point as "plain numbers." Such students will calculate 0.7 + 0.05 = 0.12, which is wrong, and I explain why in the video.
Multiply decimals by whole numbers
I explain how to multiply decimals by whole numbers: think of your decimal as so many "tenths", "hundredths", or "thousandths", and simply multiply as if there was no decimal point. Compare to multiplying so many "apples". For example, 5 x 0.06 is five copies of six "hundredths". Multiply 5 x 6 = 30. The answer has to be 30 hundredths (hundredths corresponding to apples), or 0.30, which simplifies to 0.3.
Divide decimals using mental math
I explain two basic situations where you can use mental math to divide decimals: 1) Think of "stuff" (which is tenths, hundredths, or thousandths) shared evenly between so many people; OR 2) Think how many times the divisor fits into the dividend.
Long division with decimals
When the dividend is a decimal, and the divisor is a whole number, long division is easy: just divide as if there was no decimal point, and then put a decimal point in the answer in the same place as it is in the dividend. I also show an example where we add decimal zeros to the dividend, in order to get an even division. Lastly I show how the fraction 3/7 is converted into a decimal using long division.
Sunday, April 3, 2011
Amazing Worldwide 9/11 Accident Watch Online Video Worldwide.
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Amazing Worldwide 9/11 Accident Watch Online Video Worldwide.
Amazing worldwide 9/11 Accident watch online Video worldwide new york amazing accident twin tower.
Friday, April 1, 2011
Amazing Worldwide Famous Festival Event Watch Video Online Festival Event
Amazing Worldwide Famous Festival Event Watch Video Online Festival Event
Amazing Worldwide Famous Festival Event Watch Video Online Festival Event
Amazing Worldwide Famous Festival Event Watch Video Online Festival Event
Amazing Worldwide Beautiful Talking Asian Parrot Watch Online Video Listen a Real Voice Of Parrot
Amazing Worldwide Beautiful Talking Asian Parrot Watch Online Video Listen a Real Voice Of Parrot.
Amazing Worldwide Beautiful Talking Asian Parrot Watch Online Video Listen a Real Voice Of Parrot
Amazing Worldwide Beautiful Talking Asian Parrot Watch Online Video Listen a Real Voice Of Parrot.
Thursday, March 31, 2011
Amazing Worldwide Game Snooker Best Trick Shot Worldwide Shot Game Snooker Watch Online Amazing Video.
Amazing Worldwide Game Snooker Best Trick Shot Worldwide Shot Game Snooker Watch Online Amazing Video
Amazing Worldwide Game Snooker Best Trick Shot Worldwide Shot Game Snooker Watch Online Amazing Video.
Amazing Worldwide Game Snooker Best Trick Shot Worldwide Shot Game Snooker Watch Online Amazing Video
Monday, March 7, 2011
A gorgeous movie about the beauty of linen
Very inspiring! You will see linen in my summer collection....
Thursday, August 19, 2010
Math tricks by a silly guy
A short youtube video where Kjartan Poskitt shows some math tricks. He's funny! Enjoy!
Math tricks by a silly guy
A short youtube video where Kjartan Poskitt shows some math tricks. He's funny! Enjoy!
Sunday, June 27, 2010
Vocaloid 2: Hatsune Miku 10
In honor of the first character to reach 10 cosplay features in Cosplay Holic, here is a video of Cosplayer Yumiko dancing to Hatsune Miku’s song “Strobo Nights”.
And of course, Cosplay Holic is in its Hatsune Miku Edition now (meaning: new banner, if you haven’t noticed it yet). Thanks for all the support! And thank you to all the awesome cosplayers and readers that make this site possible!
Technorati Tags: cosplay, cosplayer, holic, role, play, roleplay, costume, anime, manga, game, series, character, vocaloid, 2, hatsune, miku, honor, first, reach, 10, feature, video, yumiko, song, strobo, nights, edition, meaning, new, bannew, notice, thanks, support, awesome, readers, site, possible, コスプレ, コスプレイ, 初音, ミク
Saturday, May 8, 2010
How to teach long division
Long division is a hurdle to many students. I have written a long article about it where I approach teaching long division in several small steps. It is all also explained in this video:
How to teach long division video at YouTube
The video and the article do not delve into the "why" long division works, but suggest a specific sequence of teaching long division. It should also make the process of finding the remainder within long division more transparent to students.
Please read my article from this link: How to teach long division
What about teaching why long division works?
I feel the algorithm of long division AND why it works presents quite a complex thing for students to learn, so in this case I don't see a problem with first learning the algorithmic steps (the "how"), and later delving into the "why". Trying to do both simultaneously may prove to be too much to many students.
However, once your student has a basic mastery of how to do long division, it is time to also study what it is based on. To learn more about that, please see:
Long division as repeated subtraction
Why long division works (based on repeated subtraction)
Why long division works—a comparison with sharing money (bills) (video)
The Cookie Factory Guide to Long Division by Denise
How to teach long division video at YouTube
The video and the article do not delve into the "why" long division works, but suggest a specific sequence of teaching long division. It should also make the process of finding the remainder within long division more transparent to students.
Please read my article from this link: How to teach long division
What about teaching why long division works?
I feel the algorithm of long division AND why it works presents quite a complex thing for students to learn, so in this case I don't see a problem with first learning the algorithmic steps (the "how"), and later delving into the "why". Trying to do both simultaneously may prove to be too much to many students.
However, once your student has a basic mastery of how to do long division, it is time to also study what it is based on. To learn more about that, please see:
Long division as repeated subtraction
Why long division works (based on repeated subtraction)
Why long division works—a comparison with sharing money (bills) (video)
The Cookie Factory Guide to Long Division by Denise
How to teach long division
Long division is a hurdle to many students. I have written a long article about it where I approach teaching long division in several small steps. It is all also explained in this video:
How to teach long division video at YouTube
The video and the article do not delve into the "why" long division works, but suggest a specific sequence of teaching long division. It should also make the process of finding the remainder within long division more transparent to students.
Please read my article from this link: How to teach long division
What about teaching why long division works?
I feel the algorithm of long division AND why it works presents quite a complex thing for students to learn, so in this case I don't see a problem with first learning the algorithmic steps (the "how"), and later delving into the "why". Trying to do both simultaneously may prove to be too much to many students.
However, once your student has a basic mastery of how to do long division, it is time to also study what it is based on. To learn more about that, please see:
Long division as repeated subtraction
Why long division works (based on repeated subtraction)
Why long division works—a comparison with sharing money (bills) (video)
The Cookie Factory Guide to Long Division by Denise
How to teach long division video at YouTube
The video and the article do not delve into the "why" long division works, but suggest a specific sequence of teaching long division. It should also make the process of finding the remainder within long division more transparent to students.
Please read my article from this link: How to teach long division
What about teaching why long division works?
I feel the algorithm of long division AND why it works presents quite a complex thing for students to learn, so in this case I don't see a problem with first learning the algorithmic steps (the "how"), and later delving into the "why". Trying to do both simultaneously may prove to be too much to many students.
However, once your student has a basic mastery of how to do long division, it is time to also study what it is based on. To learn more about that, please see:
Long division as repeated subtraction
Why long division works (based on repeated subtraction)
Why long division works—a comparison with sharing money (bills) (video)
The Cookie Factory Guide to Long Division by Denise
Thursday, May 6, 2010
Hiroji Chiba - PAPERART-C (NipponTV Interview)
Interview and behind-the-scenes look at Japanese papercraft designer Hiroji Chiba presented by Oha!4 News Live, NipponTV.The interview is in Japanese, but for most of us that can't understand what they're talking about, you'll see a glimpse of how he works, from prototype to finished papercraft.
Mr. Chiba is a regular contributor at Canon Creative Park and has his own site called PAPERART-C.
Launchpad and Shuttle Papercraft [Related Posts]
Grand Piano Papercraft
Violin Papercraft
Friday, April 23, 2010
Sumimasssen - Stop Motion Papercraft Video
Sumimasssen is a short stop motion animation made out of paper (uses papercraft / paper toys), it tells the funny story about intercultural difficulties between foreign and Japanese culture.
Presented at the Kyushu University, Nakamura Lab. Graduation Work Exhibition. Planned & Produced by: Jakob Florczyk, Tibor Weissmahr, & Camila Zarate.
It looks like they used templates from Cubic Character.
Hat tip to Adi Bass for the link.
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