This wooden Cuisenaire Rods fractions kit is used for mathematical study and includes 12 trays of 74 rods to strengthen students' understanding of equivalent fractions, addition and subtraction of fractions, ratios and fraction families. It includes self-checking activities, a set of overhead rods and a 64-page instructional booklet, and is suitable for grades 4 to 6. Size: 23.4 x 18.5 x 3.8 cm. Ages 9+.