The Cattell-Horn-Carroll (CHC) factors of the Woodcock-Johnson (WJ) Arabic Tests of Cognitive Abilities were studied with a group of students at risk of Math Disability (MD) (n50) and average students (n50) between second and fourth grades. Specifically, several statistical analyses were conducted using the seven CHC factors identified by the WJ Arabic Tests and the level of math calculation skills. The two groups were matched on grade, gender, age, and father's level of education. The findings indicated that average students had higher scores in all tests, but no statistical difference exists between at risk of MD and average groups in terms of Visual-Spatial Thinking or Auditory Processing scores. In addition, the best model for predicting math calculation skills was based on a combined measure of Processing Speed and Short-Term Working Memory factors. Implications of the findings are also discussed.