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 …

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Learn some rules of thumb for multiplying positive and negative numbers. Created by Sal Khan.

The standard algorithm for multiplying a multi-digit number by a single digit number involves multiplying each place value by the single digit, and regrouping as necessary.

Sal shows lots of examples for how to multiply 2- and 3-digit numbers using "standard algorithm". Created by Sal Khan.

Explore the basics of binary numbers and bits in digital information with Khan Academy's comprehensive lessons.

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 …

Multiplying a complex number by its conjugate results in a real number. This is useful for simplifying complex numbers and is similar to the difference of squares.

Multiplying by 0.1 and 0.01 are both common calculations in various contexts (e.g. finding 10 % or 1 % of a number), so it can be useful to know how to do them quickly and accurately. Try it …

Bitwise simply means that we are dealing with individual bits, or binary numbers. In any modern/computerized encryption scheme we represent our symbols using binary digits.