alleryMultiplying by which number leaves every number unchanged?
A10
B1
C2
D0
Answer & Solution
Correct answer: B. 1
1. The identity leaves any number unchanged when multiplied.
2. a × 1 = a for every number a.
3. a × 0 = 0, which changes the number.
_Source: Wikipedia, Multiplication (CC BY-SA 4.0, rev 1378304279), Properties_
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