We examined the math facts fluency growth of students receiving explicit timing practice in either a massed, short-distributed, or long-distributed fashion. In a repeated measures group design, 43 Midwestern third-grade students completed four 1-min math probes each day for 20 days. Hierarchical linear modeling revealed that students who received practice separated by a 3-hr interval grew significantly more than students who practiced with a 10-min distribution or a massed presentation.