A string of proper fractions and the students must fill in the missing denominator or numerator.
The student should be reminded that they are computing equivalent fractions by mathematically multiplying by 1 Whole in the form of an improper fraction (i.e. 2/2, 3/3, 4/4, etc.)
Students must know basic math facts. Procedure on this website wtih resources...Accelerated Math Fact Mastery...and the Readers' Digest version.
Best of luck with your students. Blaine Helwig