Definitions/Error 6_ Incorrect 0 or 1s.md

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title: 'Error 6: Incorrect 0 or 1s'

Error 6: Incorrect 0 or 1s

Definition

When representing a/b on a number line, this error occurs if: (a) the tick marks labeled 0/N and N/N (i.e., 0 and 1) do not coincide exactly with the number line’s physical endpoints for the interval, or
(b) the number line does not have any tick or label to indicate 0 or 1.

The fraction labels 0/N and N/N should be placed exactly at the points representing 0 and 1.

Misalignment means either the endpoint tick is missing, or the labeled tick is inside or outside the drawn unit span.

Example

For 3/4, the number line ends at the tick for 1, but the label 4/4 is shifted left so it is not on the endpoint.

Or, for 3/4, the number line ends at a blank space without a specific ending tick or mark of 0 or 1, and the 3/4 label is a long distance (significantly more than 1/4 of the number line segment) away from the end.