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KeyMath-3 Diagnostic Assessment
Please visit this website for more information about the instrument:  KeyMath-3 Diagnostic Assessment.
Supplemental for TBI
Short Description of Instrument
The KeyMath-3 Diagnostic Assessment is used to assess a subject's ability to understand and apply mathematical concepts. Five subtests assess basic concepts (Numeration, Algebra, Geometry, Measurement, Data Analysis and Probability); three subtests test operations (Mental Computation and Estimation, Written Computation: Addition and Subtraction, Written Computation: Multiplication and Division); and two subtests are devoted to applying concepts (Foundations of Problem Solving and Applied Problem Solving).
The KeyMath-3 is individually administered and ranges from 30 to 90 minutes for the entire battery of tests, depending on the student's grade level. Select subtests may be administered if a professional is interested in a particular area of the student's ability.
Standard scores (M=100, SD=15), scale scores, percentiles, and grade/age equivalents are given for the Total Test, 3 areas, and 10 subtests.
Examiner should have formal training in mathematics and test interpretation.
This assessment has two versions that can be administered (by alternating versions) every three months.
Wagner, R., Torgesen, J., and Rashotte, C. (1999). Comprehensive Test of Phonological Processing. Examiner's Manual. Pearson Assessments: San Antonio, TX.
Ewing-Cobbs, L., Prasad, M., Swank, P., Kramar, L., Cox, C., Fletcher, J., Barnes, M., and Zhang, X. (2008). Arrested development and disrupted callosal microstructure following pediatric traumatic brain injury: relation to neurobehavioral outcomes.
Neuroimage 42(4), 1305-1315.
Psych Corp/ Pearson Assessments/ Pearson Education, Inc. KeyMath 3 Diagnostic Assessment. Retrieved July 10, 2012, from


Document last updated July 2019