Boonwung, R. and Somponngtam, C. 2024. The Outcomes of using Skill Practice on Problem-Solving Skills of Counting for More Than 1,000 with the 5Es Inquiry-based Learning Process for Grade 2 Students: The Outcomes of using Skill Practice on Problem-Solving Skills of Counting for More Than 1,000 with the 5Es Inquiry-based Learning Process for Grade 2 Students. RATANABUTH JOURNAL. 6, 2 (Aug. 2024), 478–488.