Abstract :
This Research aim to to know study of effective learning discovery to
ability think critically of student at items of[is effort and class energi of x country
sma ipa 2 study year masbagik 2017 / 2018. this Research type use experiment
method. Population in this research is entire/all class student of X IPA SMA
Country 2 even Masbagik semester of study year 2017 / 2018. Research Sampel
determined by using technique of sampel saturated. Class of X IPA 1 as a group
experiment while class of X IPA 2 as a group control. Research device the used is
design control only posttest. Technique data collecting use tes. Data analysed to
use uji-t one side with method of polled variant. Result of hypothesis indicate that
thitung > t of is tables of that is 1,683 > 1,676, meaning H0 refused, so that can be
concluded by study of effective learning discovery to ability think critically of
student at items of is effort and class energi of x country sma ipa 2 study year
masbagik 2017 / 2018.
Keywords: Model Discovery Learning, Ability Think Critically of Student.