When multiplying, it can be helpful to break numbers into parts.

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Grade 4th on Khan Academy: 4th grade is the time to start really fine-tuning your arithmetic skills. Not only will you be a multi-digit addition and subtraction rockstar, but you’ll extend the multiplication and division that you started in 3rd grade to several digits. You’ll also discover that you sometimes have something left over (called a “remainder”) when you divide. In 3rd grade you learned what a fraction is. Now you’ll start adding, subtracting, multiplying, and comparing them. You’ll also see how they relate to decimals. On other fronts, you’ll learn how to convert between different units (which is super important when comparing the size and speed of robot unicorns in different countries) and continue your journey thinking about various shapes in two dimensions. Some of the foundational concepts of geometry (like lines, rays and angles) also get introduced. As always, we’ll round this out with a healthy dose of applied word problems and explorations of number patterns and properties (including the ideas of factors, multiples and prime numbers). The fun must not stop! (Content was selected for this grade level based on a typical curriculum in the United States.)

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Thank you for that, you just kicked down a very large mind wall. Tears of joy! You are making a difference.

Very cool. I would do this in my head, but I can never explain to people how I do it. Thank you.

(6*1000)*(7*1000) is what?

56*8

my vision is using compensation.

(((56*2)*2)*2)

I really helps me but I don’t watch it all the time 😅😅

I really helps me but I don’t watch it all the time 😅😅

Great stuff!! I recently started The Great Courses, The Secrets of Mental Math; where professor Benjamin teaches these tricks. I love how you have incorporated these secrets of mental calculations into Khan Academy. Keep up the great work.

Boring 😡😡😡😡

how do you use the thinh=g u use