Adding and Subtracting Decimals — Quiz

Question 6 • Grade 7 Mathematics

Which number line correctly shows negative 3 minus 1 point 5 ?

Answer

Image with description A number line from negative 4 point 5 to 4 point 5 by halves. A ray extends from 0 to 3. A second ray extends from 3 to 4 point 5.

Image with description A number line ranges from negative 4 point 5 to 4 point 5 by halves. A ray extends from 0 to negative 1 point 5. A second ray above it extends from negative 1 point 5 to 1 point 5.

Image with description A number line from negative 4 point 5 to 4 point 5 by halves. A ray extends from 0 to negative 3. A second ray extends from negative 3 to negative 4 point 5.

Image with description A number line ranges from negative 4 point 5 to 4 point 5 by halves. A ray extends from 0 to negative 3. A second ray above it extends from negative 3 to negative 1 point 5.

Explanation

Start at 0 and move 3 units left to −3. Subtracting 1.5 means moving another 1.5 units left, landing at −4.5. Choice C shows these two moves: from 0 to −3, then from −3 to −4.5.

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