Adding and Subtracting Decimals — Quiz

Question 9 • Grade 7 Mathematics

Which number line correctly shows 0 point 8 plus 0 point 3 ?

Answer

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

Image with description A number line from 0 to 1 point 3 by tenths. A ray extends from 0 point 3 to 1 point 1. A second ray above it extends from 1 point 1 to 0 point 8.

Image with description A number line from 0 to 1 point 3 by tenths. A ray extends from 0 to 0 point 8. A second ray above it extends from 0 point 8 to 0.5.

Image with description A number line from 0 to 1 point 3 by tenths. A ray extends from 0 to 0 point 8. A second ray extends from 0 point 8 to 1 point 1.

Explanation

Start at 0 and move 0.8 units to reach 0.8. Then move 0.3 more units to the right, ending at 1.1, since 0.8 + 0.3 = 1.1. Choice D shows these two moves: from 0 to 0.8, then from 0.8 to 1.1.

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