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KeyMath Diagnostic Assessment – Third Edition (KeyMath-3)

The KeyMath Diagnostic Assessment – Third Edition (KeyMath-3; Connolly, 2007) is an individually administered, norm-referenced inventory designed to assess mathematical skills.


Items are divided into three areas: basic concepts, operations, and applications. Each area is further divided into subtests covering kindergarten through ninth-grade math curricula, based on content strands of the national standards set by the National Council of Teachers of Mathematics. Math communication, connections, and reasoning are also assessed. Two written computation subtests (Addition and Subtraction; Multiplication and Division) assess mathematical operations to ensure adequate diagnostic information in this area. Application subtests measure the student’s ability to apply conceptual knowledge and operations to solve math problems, identify missing elements, determine the correct operation needed, and use problem-solving strategies. Finally, applied problem solving subtests measure the use of standard and nonstandard problem-solving strategies in real-world contexts.


Author (yr) Age Range (yrs) Method of Administration/Format Approx. Time to Administer Subscales
KeyMath Diagnostic Assessment–Third Edition (KeyMath 3) Connolly (2007) 4.5-23

Individually administered, norm-referenced comprehensive assessment of math skills, based on the NCTM standards; two forms. Yields scaled scores, standard scores, percentiles, grade/age equivalents.

30-90 min.

Basic Concepts (Numeration, Algebra, Geometry, Measurement, Data Analysis and Probability); Operations (Mental Computation and Estimation; Written Computation; Addition and Subtraction; Multiplication and Division); Applications (Applied Problem Solving, Foundations of Problem Solving)

Availability: AGS/Pearson,

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