College Algebra / Unit 1 Alg 017 short lesson, about 20 seconds
The Identity Properties
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The idea
The identity property of addition says a + 0 = a; the identity property of multiplication says a · 1 = a — zero and one leave numbers unchanged.
In practice
57 + 0 stays 57; 57 · 1 stays 57. Zero is the additive identity, one the multiplicative.
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