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 rational numbers with the same sign?

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When adding two rational numbers with the same sign, add their absolute values and keep the common sign.

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How do you add two rational numbers with different signs?

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When adding two rational numbers with different signs, subtract the smaller absolute value from the larger absolute value and take the sign of the number with the larger absolute value.

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

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What happens to your balance if you spend more than you have?

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Your balance becomes negative, indicating that you owe money.

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What is the first step in adding rational numbers?

Back

Identify if the numbers have the same sign or different signs.