Abstract:
The purposes of this research for 1) develop a online lessons on problem solving through numbers
to enhance critical thinking skills of the fifth grade students. 2) to study critical thinking abilities of fifth grade
students, and 3) assess the satisfaction of an online lessons. The samples were 30 fifth grade students
within Bankotabaru school in yala province. The research instruments were 1) The online lessons
2) evaluation form 3) achievement tests contained 20 items and 4) satisfaction questionnaire. The research
statistics used were mean, standard deviation and t-test. Results of the research found that: 1) the
developed online lessons had a quality at a good level (x̅ = 4.43, S.D. = 0.50) 2) the critical thinking ability
of fifth grade students after using the online lessons was significantly higher than before at the .05 level,
and 3) the students showed satisfaction with using the developed online lessons at the high level.
(x̅ = 4.47, S.D = 0.16)
