Rational Number Operations — Test

Question 19 • {3822C} PRE ALG 8C

Which number line correctly shows 1 point 5 plus 2 point 5 ?

Answer

Image with description A number line from 0 to 6 point 5 by halves. A ray extends from 0 to 1 point 5. A second ray extends from 1 point 5 to 3.

Image with description A number line from 0 to 6 point 5 by halves. A ray extends from 0 to 1 point 5. A second ray extends from 1 point 5 to 4.

Image with description Number line ranging from 0 to 6.5 in increments of 0.5. The visible number labels are 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, and 6.5. One ray begins at 0 and extends right to 2.5. A second ray begins at 2.5 and extends right to 5.

Image with description Number line ranging from 0 to 6.5 in increments of 0.5. The visible number labels are 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, and 6.5. One ray begins at 1.5 and extends right to 3. A second ray begins at 3 and extends right to 5.5.

Explanation

Start at 0 and move 1.5 units to the right. Then add 2.5 by moving 2.5 more units, ending at 4 because 1.5 + 2.5 = 4. Choice B shows the first ray from 0 to 1.5 and the second from 1.5 to 4.

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