In this study it is investigated that teaching of different pattern types by using computer animations and activities. The sample of this study was 28 eighth grade students in second semester of 2010-2011 educational years. They are at public school in Ankara. The one group pre-test post-test design was used for research methodology. Data were collected by pre-test and post-tests which were developed by researchers and it was revised in terms of reliability and administered to the students. The subject was showed by using computer to the students after pre-test. At the end of the teaching, that achievement test was applied on the group as the post-test. For data analysis, quantitative methods were used. According to the findings; academic performance of the students increased by using computer animations and activities about patterns. Also, it is found that there was a significant difference between academic performances of students about different pattern types.