Rational Number Operations — Test

Question 3 • {3822C} PRE ALG 8C

Which number line correctly shows 4 point 5 minus 2 point 5 ?

Answer

Image with description Number line ranging from negative 4.5 to 0 with tick marks every 0.5. The visible number labels are negative 4.5, negative 4, negative 3.5, negative 3, negative 2.5, negative 2, negative 1.5, negative 1, negative 0.5, and 0. One ray begins at negative 4.5 and extends right to negative 2. A second ray begins at 0 and extends left to negative 4.5.

Image with description Number line ranging from negative 4.5 to 2.5 with tick marks every 0.5. The visible number labels are negative 4.5, negative 3.5, negative 2.5, negative 1.5, negative 0.5, 0.5, 1.5, and 2.5. One ray begins at 0 and extends left to negative 4.5. A second ray begins at 2.5 and extends left to 0.

Image with description Number line ranging from negative 2.5 to 4.5 with tick marks every 0.5. The visible number labels are negative 2.5, negative 1.5, negative 0.5, 0.5, 1.5, 2.5, 3.5, and 4.5. One ray begins at negative 2.5 and extends right to 0. A second ray begins at 0 and extends right to 4.5.

Image with description Number line ranging from 0 to 4.5 with tick marks every 0.5. The visible number labels are 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, and 4.5. One ray begins at 0 and extends right to 4.5. A second ray begins at 4.5 and extends left to 2.

Explanation

Start at 0 and move right 4.5 units to reach 4.5. Subtracting 2.5 means moving 2.5 units left, which brings you to 2. Choice D shows these two moves on the number line.

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