Instrumentation:
Achievement test: In this study, the achievement test
was used to measure the students’ mastery of the topic
of fractions. The pre and post test contained 16
objectives questions and 10 subjective questions. The
time allocated is 60 min. Each subjective item is
allocated five points, while two marks allocated to each
objectives item. All items used are based on form 1
mathematics syllabus. Validity is an important feature for
an instrument (Wiersma, 2000). An instrument is said to
have high validity if the degree of its ability to measure
what it should be measured is high. All the items were
reviewed by the Head of Department of Mathematics and
Science and expert teachers for validation.