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It is easy to avoid dividing by zero with a numerical fraction because you can:

ASee the denominator
BIgnore the numerator
CRound the fraction
DCancel the fraction
Answer & Solution
Correct answer: A. See the denominator
1. Numbers are more transparent than variables. 2. Division by zero is undefined in every case. 3. When we work with a numerical fraction, it is easy to avoid dividing by zero. 4. That is because we can see the number in the denominator. _Source: OpenStax Elementary Algebra 2e (CC BY 4.0), Ch 8 'Rational Expressions and Equations', sections 8.1-8.9_
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