Comparing positive and negative numbers on the number line

The topic  is a topic under the 6th Grade Math Mission. This exercise practices the relationship between positives, negatives and opposites.

Types of Problems
There are three types of problems in this exercise:


 * 1) Select all that hold (abstract): This problem provides a number line with some points abstractly labeled with a, b, c and d. There is a list of possible correct statements from which the student is expected to select all statements that are true.Cpannotnl1.png
 * 2) Select all that hold (specific): This problem provides a number line with two rational numbers labeled. There is a list of possible correct statements from which the student is expected to select all statements that are true.Cpannotnl2.png
 * 3) Adjust line and select: This problem provides a line with a scale that can be changed. After changing the scale, the student is asked to plot a given point and then select some statements that hold from a multiple select list.Cpannotnl3.png

Strategies
This exercise is hard to get accuracy badges because special care needs to be taken when looking at the abstract problem in particular. The speed badges are hard because of the time it currently takes to be accurate.
 * 1) Hints will be provided later as soon as research locates some ideas to improve accuracy and efficiency.