The psychometric properties of a 10-item math motivation scale were empirically validated with an independent sample consisting of 182 elementary-school students. Analysis of the model dimensionality supported a one-factor structure fit. Item parameter estimates from a Classical Test Theory framework revealed that most items were highly discriminating, and the survey is informative for students of low to average math motivation. Differential item functioning (DIF) analyses found two items exhibiting gender bias. Overall, the instrument was a psychometrically valid instrument for measuring math motivation at the elementary level.