Learning Resources Let's Learn to Measure Activity Set. Perfect for the classroom or home learning, this activity set helps deepen students’ understanding of volume and fractional relationships through a variety of activities using some of our most popular maths resources. Children use Rainbow Fraction® Measuring Cups, a Nestable Bucket Balance, and award-winning MathLink® Cubes to lean about volume, weight, length, height, and capacity. The set includes 4 Rainbow Fraction Measuring Cups, 1 Nestable Bucket Balance, 20 MathLink Cubes, 10 double-sided Activity Cards, a Multilingual Guide. 37 Piece Set.