Rational number operations flashcards

Question 1

What is a rational number?

Accepted Answer

A number that can be written as a ratio $\frac{a}{b}$ where $a$ and $b$ are integers and $b
eq 0$.

Question 2

How do you add two rational numbers with different signs?

Accepted Answer

Subtract the smaller absolute value from the larger absolute value, then use the sign of the number with the larger absolute value.

Question 3

How do you divide rational numbers, and when do you use this rule?

Accepted Answer

Divide by multiplying by the reciprocal: $$\frac{a}{b}\div\frac{c}{d}=\frac{a}{b}\cdot\frac{d}{c},\quad b,c,d
eq 0.$$ Use this whenever you need to compute a quotient of fractions or rational numbers.

Rational number operations flashcards

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