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# Arithmetic

With this mental math trick you will beable to add and subtract in your head rapidly – a critical skill in everyday math. In this video we look at tips on how to do basic addition and subtraction instantly without using a calculator. Fast math is good math!

A brief tutorial on how to find the Arithmetic Mean (often referred to as the Mean or Average). Go to http://Teachtopia.com for more educational videos.

Learn how to solve word problems by adding small numbers (numbers 10 or less). Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-basics/cc-early-math-add-sub-word-problem-within-10/e/addition-word-problems-within-10?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-basics/cc-early-math-add-sub-word-problem-within-10/v/subtraction-word-problems-within-10?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-basics/cc-early-math-add-subtract-10/v/addition-and-subtraction-within-10?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and becomes […]

Learn how to subtract 14 – 6 by first thinking about subtracting 2 and 4. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-20/cc-early-math-sub-20/e/subtraction_2?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-20/cc-early-math-equals-sign/v/equal-sign?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-20/cc-early-math-add-20/v/adding-3-numbers?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and […]

Mr. C teaches you two very important steps to understanding and then solving word problems and number stories.

To see all my Chemistry videos, check out http://socratic.org/chemistry How to do addition and subtraction with significant figures, also known as significant digits.

If you can’t get enough of Sal adding and subtracting polynomials, here’s a bunch of many more examples. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algebra2/polynomial_and_rational/polynomial_tutorial/e/adding_and_subtracting_polynomials?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraII Watch the next lesson: https://www.khanacademy.org/math/algebra2/polynomial_and_rational/polynomial_tutorial/v/multiplying-polynomials?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraII Missed the previous lesson? https://www.khanacademy.org/math/algebra2/polynomial_and_rational/polynomial_tutorial/v/terms-coefficients-and-exponents-in-a-polynomial?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraII Algebra II on Khan Academy: Your studies in algebra 1 have built a solid foundation from which you […]

算术与代数预备课程：加法与减法: 减法1 Arithmetic and Pre-Algebra: Addition and subtraction: Basic Subtraction Video Rating: / 5

Go to http://www.examsolutions.net/maths-revision/index.php to see the main index of maths video tutorials Video Rating: / 5

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-20/cc-early-math-word-problems-within-20/e/addition-and-subtraction-word-problems-within-20–level-1?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-20/cc-early-math-word-problems-within-20/v/exercising-gorillas?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-20/cc-early-math-equals-sign/v/equal-sign?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, […]

A simple example to illustrate the basic idea of arithmetic coding. A playlist of these videos is available at:

Practice your basic subtraction skills while enjoying a game of bowling! Visit http://www.starfall.com for more great activities that make learning fun!

Learn how to solve word problems by subtracting small numbers (numbers 10 or less). Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-basics/cc-early-math-add-sub-word-problem-within-10/e/subtraction-word-problems-within-10?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-place-value-topic/cc-early-math-teens/v/teens-and-ten?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-basics/cc-early-math-add-sub-word-problem-within-10/v/addition-word-problems-within-10?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and becomes […]

Forget finding common denominators when adding dissimilar fractions – this way is much faster and easier. This video also looks at how to deal with mixed numbers and simplification.

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