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  1. Khan Academy | Khan Academy

    Oops. Something went wrong. Please try again. Uh oh, it looks like we ran into an error. You need to refresh. If this problem persists, tell us.

  2. Multiplying in binary (video) | Khan Academy

    To multiply numbers in base 2, we can use the same process as we would in base 10, but with only two digits: 0 and 1. Start by multiplying the rightmost digit of one number by each digit of the other …

  3. Binary numbers | AP CSP (article) | Khan Academy

    Binary numbers The binary system works the same way as decimal. The only difference is that instead of multiplying the digit by a power of 10 , we multiply it by a power of 2 .

  4. Binary numbers | AP CSP (article) | Khan Academy

    Course: AP®︎/College Computer Science Principles > Unit 1 Lesson 2: Binary numbers Binary numbers Decimal system refresher The binary number system

  5. Modular exponentiation (article) | Khan Academy

    What can we do to reduce the size of terms involved and make our calculation faster? Suppose we want to calculate 2^90 mod 13, but we have a calculator that can't hold any numbers larger than 2^50.

  6. The binary number system | AP CSP (video) | Khan Academy

    Binary numbers form the basis of computing systems. Binary numbers contain only the digits 0 or 1, or bits, where each bit represents a power of two. To convert binary to decimal, multiply each bit by its …

  7. Unit 3: Multiply by 2-digit numbers - Khan Academy

    We're going to learn how to multiply big numbers together! We'll use cool tools like area models and partial products. We'll even learn how to guess a value close to the product before we do the math. …

  8. Multiplying 2-digit numbers (video) | Khan Academy

    Learn to multiply two-digit numbers. In this video, we will multiply 36 times 27. Created by Sal Khan.

  9. Converting decimal numbers to binary - Khan Academy

    Learn a technique for converting decimal numbers into binary numbers using just pen, paper, and calculations. Works best for small numbers, since bigger numbers require increasingly more …

  10. Multiply by 1-digit numbers | 4th grade math | Khan Academy

    This unit will teach you all about multiplying by 1-digit numbers using the distributive property, area models, and multiples of 10. With these tools in your math toolkit, you'll be a multiplication master in …