Abstract
The study aimed at exploring the effectiveness of teaching instructional units designed according to STEM approach on developing mathematical proficiency among first grade secondary school students. To achieve the aims of this study a quasi -experimental method was used with equivalent experimental and control groups and pre- and posttest design. The sample of the study consisted of 46 students from Al-Rowad Private Schools in Riyadh, divided equally into two groups. The experimental group was taught the two units that were designed according to STEM approach, while the control group was taught the same units by using the traditional methods. Then the two groups were subjected to an achievement test and a productive disposition toward mathematics scale.
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