סרטונים מובילים
Multiplying negatives is a very important part of algebra. This tutorial outlines how to go about multiplying negative numbers, and demonstrates the process with examples.
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This tutorial gives two different examples of how to convert percentages into fractions and decimal form.
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Let's gain some practice using tally charts to represent data using a picture graph! (3rd grade learning standard)
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Represent and interpret data.
CCSS.MATH.CONTENT.3.MD.B.3
Draw a scaled picture graph and a scaled bar graph to represent a data set with several categories. Solve one- and two-step "how many more" and "how many less" problems using information presented in scaled bar graphs. For example, draw a bar graph in which each square in the bar graph might represent 5 pets.
What is a picture graph?
What is a tally chart?
How can I use a picture graph to make a tally chart?
How can I use a tally chart to make a picture graph?
Practice with tally charts and picture graphs
...
MashUp Math is a great free resource for math students, parents, and teachers. Our lessons are a great resource for struggling students, flipped classroom educators, and homeschool math students.
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On this lesson, you will learn how to perform reflections over the x-axis and reflections over the y-axis (also known as across the x-axis and across the y-axis) and reflections over the line y=x.
For more MashUp Math content, visit http://www.mashupmath.com and join our free mailing list! :)
Download the free PDF lesson guide here: https://mashupmath.com/blog/re....flection-over-x-y-ax
This lesson answers the questions: How do I reflect a figure over a line? How do I reflect a point over the line y=x? How do I reflect a point? What is the difference between a reflection and rotation? How do I reflect over the line y=-x?
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In this math tutorial we look at the trick for quickly converting between the two main temperature scales - Celsius and Fahrenheit. This method will allow you to simply convert between the two forth and back, back and forth, and then back, and then forth again!
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It is easy to mentally subtract numbers = even big numbers - by following a few simple ideas.
Subtract from left to right. Makes sense - that's the way we think of numbers so subtract in that order too!
Next we can choose our level of difficulty, and borrow as we go through the answer.
BTW
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We look at the trigonometric functions: sine, cosine, and tangent used to work out sides and angles in right angle triangles.
You will learn the following steps -
1. Labelling the sides - opposite, adjacent and hypotenuse,
2. Determining which trig function should be used - SOHCAHTOA - (sin = opposite / hypotenuse,
cos = adjacent / hypotenuse, tan = opposite / hypotenuse)
3. Substitution of values.
4. Calculation.
By going though all the trigonomic functions this video will help you master this topic - through the use of a few math tricks! To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
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To learn the times tables use your hands as well as your head! Multiplication had never been so easy using this easy trick - including some of the six, seven, eight, nine and ten times table.
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Use this method to solve algebra equations where you have variables on each side of the equation!
Solve algebra equations instantly - OK, maybe in about 10 seconds! This fast math trick for instant calculation will have you correctly answering algebraic equations with pronumerals on both sides - even beginners! To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
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This math trick allows you to work out the square root of any number - NOT JUST PERFECT SQUARES - instantly. With decimals. With ease. Can you work faster than a calculator? With this tecmath trick you just might! The math shortcut magic is back!
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Quadratic equations can be factorised rapidly with this cool fast math trick. Algebra made easy.
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Pete the Cat: The First Thanksgiving - Children's Stories Read Aloud for Kids
Click here to purchase Pete the Cat: The First Thanksgiving: https://www.amazon.com/Pete-Ca....t-Thanksgiving-James
Join Pete in New York Times bestselling artist James Dean's Pete the Cat picture book series as Pete celebrates Thanksgiving in this groovy lift-the-flap book!
Starring in the school Thanksgiving play would make even the coolest cat nervous. But when Pete the Cat gets onstage, he makes learning the story of the first Thanksgiving fun. With thirteen flaps that open to reveal hidden surprises, this book is sure to be a holiday favorite for every Pete the Cat fan.
Aliens Love Dinopants
by Claire Freedman
Illustrated by Ben Cort
Read by Let's Read Stories
When the aliens crash-land in the jungle, they have no idea that they are about to stumble on the biggest stash of pants ever. Their glee knows no bounds! That is, until the prehistoric owners of the outsized stash turn up... A fabulous new book in the bestselling Underpants series which brings together aliens and dinosaurs into one interstellar, pantstastic adventure!
Click here to purchase : https://www.amazon.com/Aliens-....Love-Dinopants-Clair
In which John Green teaches you about the Cold War, the decades-long conflict between the USA and the USSR. The Cold War was called cold because of the lack of actual fighting, but this is inaccurate. There was plenty of fighting, from Korea to Viet Nam to Afghanistan, but we'll get into that stuff next week. This week we'll talk about how the Cold War started. In short, it grew out of World War II. Basically, the Soviets occupied Eastern Europe and the US-supported western Europe. This setup would spill across the world, with client states on both sides. It's all in the video. You should just watch it.
Hey teachers and students - Check out CommonLit's free collection of reading passages and curriculum resources to learn more about the events of this episode. The Cold War spanned over four decades of American history, beginning with the paranoia of McCarthyism, a political witch hunt for communists: https://www.commonlit.org/texts/mccarthyism
President Kennedy delivered an Inaugural Address during the height of the Cold War, initiating a space race: https://www.commonlit.org/text....s/president-kennedy-
President Kennedy also oversaw Cuba's emergence as a Cold War rival of the United States:
https://www.commonlit.org/text....s/cold-war-rivals-cu
Want to learn more about the Cold War? Check out these other videos from Crash Course:
USA vs USSR Fight! The Cold War: Crash Course World History #39:
https://www.youtube.com/watch?v=y9HjvHZfCUI
The Cold War in Asia: Crash Course US History #38:
https://www.youtube.com/watch?v=Y2IcmLkuhG0
George HW Bush and the End of the Cold War: Crash Course US History #44:
https://www.youtube.com/watch?v=L-K19rVDxoM
The Cold War and Consumerism: Crash Course Computer Science #24:
https://www.youtube.com/watch?v=m8i38Yq1wX4
Post-War Rebuilding and the Cold War: Crash Course European History #41:
https://www.youtube.com/watch?v=-rkIqtV07HE
Chapters:
Introduction: The Cold War Era 00:00
The Aftermath of WWII 1:57
USSR Expansion & Containment 2:38
The Truman Doctrine 3:34
The Marshall Plan 5:01
The Berlin Crisis 6:18
Mystery Document 7:19
Consensus on Cold War Policies 8:28
Impact of the Cold War on Domestic Policy 10:03
Espionage, McCarthyism, and the Red Scare 10:53
Credits 12:49
-------
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I'm sure you've heard of Pavlov's Bell, but what was Ivan Pavlov up to, exactly? And how are our brains trained? And what is a "Skinner Box"? All those questions and more are answered in today's Crash Course Psychology, in which Hank talks about some of the aspects of learning.
Want more videos about psychology? Check out our sister channel SciShow Psych at https://www.youtube.com/scishowpsych!
--
Chapters:
Introduction: Ivan Pavlov 00:00
Associative Learning 1:33
Classical Conditioning 2:47
Behaviorist Theory 4:22
Watson's Experiments 4:46
Operant Conditioning 5:42
Positive & Negative Reinforcement 7:18
Primary Reinforcers & Conditioned Reinforcers 8:54
Reinforcement Scheduling 9:32
Review & Credits 11:00
--
Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse
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We talk a lot about Keynesian economics on this show, pretty much because the real world currently runs on Keynesian principles. That said, there are some other economic ideas out there, and today we're going to talk about a few of them. So, if you've been aching to hear about socialism, communism, the Chicago School, or the Austrian School, this episode is for you.
Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse
Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
Fatima Iqbal, Penelope Flagg, Eugenia Karlson, Alex S, Jirat, Tim Curwick, Christy Huddleston, Eric Kitchen, Moritz Schmidt, Today I Found Out, Avi Yashchin, Chris Peters, Eric Knight, Jacob Ash, Simun Niclasen, Jan Schmid, Elliot Beter, Sandra Aft, SR Foxley, Ian Dundore, Daniel Baulig, Jason A Saslow, Robert Kunz, Jessica Wode, Steve Marshall, Anna-Ester Volozh, Christian, Caleb Weeks, Jeffrey Thompson, James Craver, and Markus Persson
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Hank tells us about the city of Eukaryopolis - the animal cell that is responsible for all the cool things that happen in our bodies.
Table of Contents time codes
1) Robert Hooke 1:59
2) Cilia/Flagella 2:52
3) Cell Membrane 3:32
4) Cytoplasm/Cytoskeleton/Centrosomes 3:58
5) Endoplasmic Reticulum 4:41
6) Ribosomes 5:45
7) Golgi Apparatus 6:00
8) Lysosomes 6:47
9) Nucleus 7:06
10) Mitochondria 9:14
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Models are great, except they're also usually inaccurate. In this episode of Crash Course Chemistry, Hank discusses why we need models in the world and how we can learn from them... even when they're almost completely wrong. Plus, Lewis Structures!
Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: https://apple.co/3d4eyZo
Download it here for Android Devices: https://bit.ly/2SrDulJ
--
Table of Contents
Models 0:06
Linus Pauling & The Bonding Model 9:16
Lewis Dot Structures 4:27
Ionic Bonds 5:30
Covalent Bonds 6:10
Double Bonds 7:17
Triple Bonds 8:14
Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse
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Hank calls in a friend to do his push-ups for him today to explain how skeletal muscles work together to create and reverse movements. Hank and Claire also demonstrate the role size plays in motor units, the three-phase cycle of muscle twitches, and how the strength and frequency of an impulse affect the strength and duration of a contraction. This episode also explains twitch summation, tetanus, and isotonic vs. isometric movements.
Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: https://apple.co/3d4eyZo
Download it here for Android Devices: https://bit.ly/2SrDulJ
Chapters:
Introduction: Heavy Lifting 00:00
How Muscles Push & Pull 1:13
Functional Muscle Groups: Prime Movers, Antagonists, and Synergists 2:27
Motor Units 3:49
3 Phases of Muscle Twitches: Latent, Contraction, Relaxation 4:41
Graded Muscle Responses 5:22
Temporal Summation vs Tetanus 6:19
Multiple Motor Unit Summation (Recruitment) 7:07
The Size Principle of Recruitment 7:52
Isotonic vs Isometric Movements 8:50
Review 9:28
Credits 9:59
***
Crash Course is now on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse
Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
Mark Brouwer, Jan Schmid, Steve Marshall, Anna-Ester Volozh, Sandra Aft, Brad Wardell, Christian Ludvigsen, Robert Kunz, Jason, A Saslow, Jacob Ash, Jeffrey Thompson, Jessica Simmons, James Craver, Simun Niclasen, SR Foxley, Roger C. Rocha, Nevin, Spoljaric, Eric Knight, Elliot Beter, Jessica Wode
***SUBBABLE MESSAGES***
TO: Ariela
FROM: Gavi
I love you so much, stay awesome as always!
--
TO: Josiah P.
FROM: Amy P.
I love you!
***SUPPORTER THANK YOU!***
Thank you so much to all of our awesome supporters for their contributions to help make Crash Course possible and freely available for everyone forever:
Vanessa Benavent, Les Brown, John Hadfield, Damian Shaw, Burt G. Clothier & Tad A. Saine, Ashley Williamson, Carrie Williamson, Melissa A, Lopin Forsythe, Trevor Sacks
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In order to understand how we study the universe, we need to talk a little bit about light. Light is a form of energy. Its wavelength tells us its energy and color. Spectroscopy allows us to analyze those colors and determine an object’s temperature, density, spin, motion, and chemical composition.
Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/product....s/crashcourse-astron
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Chapters:
Introduction 00:00
Light is a Wave 0:31
Electromagnetic Spectrum 1:32
How is Light Made? 3:19
Atomic Structure 4:47
Spectroscopy 7:14
Redshift vs Blueshift 8:26
Review 9:50
--
PBS Digital Studios: http://youtube.com/pbsdigitalstudios
Follow Phil on Twitter: https://twitter.com/badastronomer
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Support CrashCourse on Patreon: http://www.patreon.com/crashcourse
--
PHOTOS/VIDEOS
Wavelengths http://imagine.gsfc.nasa.gov/e....ducators/gammaraybur [credit: Imagine the Universe! / NASA]
Observatories across spectrum http://imagine.gsfc.nasa.gov/I....mages/science/observ [credit: Imagine the Universe! / NASA]
Red hot spiral hotplate http://freefoodphotos.com/imag....elibrary/cooking/sli [credit: freefoodphotos.com]
The Crab Nebula http://en.wikipedia.org/wiki/N....ebula#/media/File:Cr [credit: NASA, ESA, J. Hester and A. Loll (Arizona State University)]
Building the Space Telescope Imaging Spectograph http://imgsrc.hubblesite.org/h....u/gallery/db/spacecr [credit: NASA]
VST images the Lagoon Nebula http://en.wikipedia.org/wiki/L....agoon_Nebula#/media/ [credit: ESO/VPHAS+ team]
Jupiter http://www.nasa.gov/images/con....tent/414987main_pia0 [credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute]
Venus http://en.wikipedia.org/wiki/A....tmosphere_of_Venus#/ [credit: NASA - NSSDC Photo Gallery Venus]
Ring Around SN 1987a, image 1 http://www.spacetelescope.org/images/opo9714e/ [credit: Jason Pun (NOAO) and SINS Collaboration]
Ring Around SN 1987a, image 2 http://www.spacetelescope.org/images/opo9714a/ [credit: George Sonneborn (GSFC) and NASA/ESA]
How can Daenerys Targaryen help us understand personal identity? Find out as Hank continues our exploration of personal identity, learning about Hume’s bundle theory and Parfit’s theory of survival through psychological connectedness.
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Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios
Crash Course Philosophy is sponsored by Squarespace.
http://www.squarespace.com/crashcourse
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CC Kids: http://www.youtube.com/crashcoursekids
