Discussion
What is the result when 7 kg 7 g is subtracted from 9 kg ?
Answer: D
9 kg minus 7 kg 7 g is 1.993 kg.
Convert everything to grams or to kilograms with three decimal places, since 1 kg = 1000 g. Then 7 kg 7 g = 7.007 kg, not 7.7 kg or 7.07 kg.
\[ \begin{aligned} 9.000 - 7.007 &= 1.993\ \text{kg} \\ \text{or } 9000 - 7007 &= 1993\ \text{g} \end{aligned} \]
The distractors come from place-value slips with the 7 g. Writing it as 7.07 kg gives 1.93 kg; 1.093 kg and 1.3 kg come from similar misplacements of the grams. Remembering that grams occupy three decimal places of a kilogram avoids all of them.
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