Helling J, McLaughlin TF, Weber KP, Dolliver M “Polly, Slotvig P. 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. IJEE [Internet]. 2016 Jan. 4 [cited 2026 Oct. 27];5(1):391-402. Available from: https://ijee.org/ijee/article/view/644