Table 2.

Mean number of correct items on the experimental arithmetic measures: four fact retrieval subtests and two procedural computation subtests, as well as their overall average scores. Standard deviations are shown in parentheses.

		Measure	Raw Scores	Average Raw Scores	Average Raw Score Range
Fact Retrieval	Addition	Addition 0–12 (/25)	14.35 (5.9)	9.94 (4.4)	0.75– 20.75
		Addition 0–18 (/25)	11.10 (4.6)
	Subtraction	Subtraction 0–12 (/25)	7.46 (4.5)
		Subtraction 0–18 (/25)	6.86 (4.7)
Procedural Computation	Addition	Double-Digit Addition (/20)	12.37 (6.0)	9.50 (5.0)	0 – 20.00
	Subtraction	Double-Digit Subtraction (/20)	6.63 (4.9)