Hi Mag,
The number links the RIT score from the NWEA MAP test.
Quote
What is RIT?
Tests developed by NWEA use a scale called RIT to measure student achievement and growth. RIT stands for Rasch UnIT, which is a measurement scale developed to simplify the interpretation of test scores. The RIT score relates directly to the curriculum scale in each subject area. It is an equal-interval scale, like feet and inches, so scores can be added together to calculate accurate class or school averages.
http://www.district90.org/documents/parenttoolkit.pdf