Helling, Jeffrey, T. F. McLaughlin, Kimberly P. Weber, Mary “Polly Dolliver, and Peggy Slotvig. “The Effects of Direct Instruction Procedures With a Place Value Chart and Model-Lead-Test Error Correction Procedure to Teach Regrouping With Three-Digit Subtraction Accuracy: A Case Study Disabilities”. International Journal of English and Education 5, no. 1 (January 4, 2016): 391–402. Accessed October 27, 2026. https://ijee.org/ijee/article/view/644.