Improving Students' Critical Thinking Skills through Student Worksheet Colloid Systems Based on Discovery Learning and Multiple Representations at Senior High School

Abstract

Expansion study with the Plomp method has been carried out to produce student worksheet colloid systems based on discovery study and multiple representations to increase learners' critical thinking skills. Sampling was done by apply the cluster purposive sampling technique. Study instruments apply is the problem sheet, a problem sheet in the form of sheet validity and practicalities, about objective and about the critically thinking skills. Outcome of the study showed that the resulting student worksheet shows the validity of which is very high (k = 0, 83). The outcome of the practicality of small group learner were very high k = 0.834. In the field test, the practicality of learner was very high (k = 0.815) while the practicality by the teacher was high (k = 0.74). Hypothesis test of study outcomes shows that there is a notable diverse between the study outcomes of experimental classroom learner and control classroom learner. The outcome of the critically thinking skills of hypothesis testing showed that there are notable diverse between the critically thinking skills of learners experimental and control classrooms. In addition, the study outcome show that student worksheet has met the criteria of being practical and impactive.