This topic focuses on practicing the skill of finding missing numerators in equivalent fractions. Each problem presents a simple fractional equation, where students need to determine the numerator that makes two fractions equivalent. The fractions involved are generally simple, using denominators like 2, 3, 4, 5, 6, 8, 9, 10, and 18. Multiple choice answers are provided for each question, reinforcing the concept of equivalent fractions within the context of early fraction learning and addition/subtraction strategies.