doubling
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When you add a number to itself, you are multiplying it by 2. The usual term for this is you are doubling the number.
It is called algebra. When two quantities are related as long as you do the same operation to both (add, subtract, multiply, or divide) you do not change the relation
8128 They're known as perfect numbers.
I say 247. Add the number by itself and subtract 3. :]] ~Mega:]
When you add two (or any number of) numbers together, the result is called the sum.