id	keyword
edu-1714	preservice teachers
edu-1714	strategies
edu-1714	problem
edu-1714	solving
edu-1714	grade
edu-1714	number
edu-1714	solution
edu-1714	mathematics teachers
edu-1714	journal
edu-1714	level
edu-1714	asian
edu-1714	strategy
edu-1714	table
edu-1714	education