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
If you add zero to any number, the sum is the same number you started with.
When you add two (or any number of) numbers together, the result is called the sum.
8128 They're known as perfect numbers.