**Abstract**

This
study aims to describe the kinds of the students' errors and the factors
causing the errors in answering math tests of geometry subject based on Newman
procedures. The study used descriptive qualitative method. The research
findings showed that the percentages of the students' errors in answering math
test of flat side space shape based on Newman procedures were: (a) the
percentage of the students' reading error was 17%, (b) the percentage of the
students' conceptual understanding error was 74%, (c) the percentage of the
students' transformation error was 83%, (d) percentage of the students' process
skill error was 87%, and (e) the percentage of the students' errors in answer
writing was 100%. The total percentage of the students' errors was 72%. The
factors that caused the students' errors were that the students were not fluent
in reading the tests and the students were lack of knowledge about signs in
mathematic tests; the students did not have ability in writing what they knew
and what was being asked in the tests correctly; the students did not master
the subject of flat side space shape; the students were lack of practice in
doing the exercises; the students only did the tests randomly; the students did
not like math lesson; the students did not understand the method used in
answering the tests correctly; the students did not understand the formula
used; and the students were in hurry in doing the test.

Source: https://iopscience.iop.org/article/10.1088/1742-6596/1114/1/012048/meta