any number plus 0 equals the previously said number
20+0=20 demonstrates the zero property
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When adding zero to anything, the sum is the original number.
"Dose" is a measured portion of a medicine. So dose zero must refer to a placebo. Or if you are asking what is the zero property of addition: The zero property of addition states that adding zero to any number will not change the number. Thus: x + 0 = x
Adding zero to any number exemplifies the identity property of addition. For example, 12 + 0 = 12 where adding zero does not change the sum.
The relevant properties are the commutative property, the associative property, and the property of zero (i.e., if you add zero to a number you get the same number again).
When you add zero to any quantity, the sum is the original quantity.