Kari estimated the quotient of negative 12 and 1 fifth divided by 4 2 fifths to be negative 8 Which best describes her error?

The mixed numbers are about −12 and 4, so the quotient should be estimated by dividing: −12 ÷ 4 = −3. Kari’s estimate of −8 comes from adding those compatible numbers instead: −12 + 4 = −8. Her error was adding rather than dividing.

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