Adding and Subtracting Rational Numbers

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What is a rational number?

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A rational number is any number that can be expressed as the quotient or fraction of two integers, where the denominator is not zero.

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How do you add two mixed numbers?

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To add two mixed numbers, convert them to improper fractions, find a common denominator, add the fractions, and then convert back to a mixed number if necessary.

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What is the process for subtracting rational numbers?

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To subtract rational numbers, find a common denominator, subtract the numerators, and simplify the result if possible.

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What does it mean to subtract a negative number?

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Subtracting a negative number is the same as adding its positive counterpart.

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How do you convert a mixed number to an improper fraction?

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Multiply the whole number by the denominator, add the numerator, and place the result over the original denominator.

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The result is positive.

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Front

If Andrea has a $20 gift card and spends $3.89 and $2.90, what is her new balance?

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$13.21.