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Earn +20 ptsQ: Why is 0 the identity number for subtraction?
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Which number is known as the additive identity which number is the multiplicative identity?
Additive identity: zero. Multiplicative identity: one.
What property states that adding 0 to a number does not change the number?
It is the additive identity property of zero.
Does the set of a rational number have an additive identity?
Yes: it is 0.
Is the set of irrational numbers closed under subtraction?
No; here's a counterexample to show that the set of irrational numbers is NOT closed under subtraction: pi - pi = 0. pi is an irrational number. If you subtract it from itself, you get zero, which is a rational number. Closure would require that the difference(answer) be an irrational number as well, which it isn't. Therefore the set of irrational numbers is NOT closed under subtraction.
A number from which a number is being subtracted?
In subtraction, the minuend minus the subtrahend equals the difference.
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