Learning Resources Three Bear Family Primary Bucket Balance. The Three Bear Family also popularly known as the Compare Bears makes abstract maths concepts come to life for young children. Use the Primary Bucket Balance set to help children learn about measuring and comparing weight and volume. The clear 400ml buckets feature marked measurement indicators and can hold liquids or dry goods such as the 102 Compare Bears maths counters included with the set. The buckets have pouring spouts, and lids use the lids to convert to a platform balance. Store the Three Bear Family counters in the balances storage drawer. The set includes 1 balance with storage drawer, 2 x 400ml clear buckets with pouring spouts and lids, 102 bears in 6 bright colours (17 of each) and a multilingual Activity Guide.