Abstract: This qualitative research focused on Seventh grade students’ misconceptions during algebraic problem solving. 15 open-ended algebraic tasks were developed, standardised and administered to 12 Seventh grade school students in Lagos State. Test items were developed with focus on the highlighted possible algebraic misconceptions as identified in the literature review. After the test administration, each item and student’s solutions were categorised by coding the misconceptions under the identified possible misconceptions in the literature review.