Multiplying a Double-Digit Number by a Single-Digit Number
http://demonstrations.wolfram.com/Mul...
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Here is a useful way to think of multiplying a double-digit number by a single-digit number. First, think of the two-digit number as two separate numbers. For example, to find 8◊73 :
Contributed by: Sarah Lichtblau
Suggested by: Eileen Lichtblau
