This research thesis, written in Hebrew, tries to apply various methods of measuring readability to ranking the readability of two mathematics textbooks widely used in the seventh grade. The readability was measured by formula, by expert judgment, by cloze procedure, and by comprehension tests. High correlations were obtained between the rankings of the readability by formula, judgment, and cloze procedure. This suggests the possibility of using the convenient and easy method of the readability formula to rank the readability of Hebrew mathematical texts. An abstract of the thesis is written in English. (MP)