TLF ID L5979
Balance scales by using blobs. Using unit ratios, such as 1:3, 2: 1 or 1:4, explore how many black blobs and white blobs balance each other. Discover the rule that balances the scales with the correct number and type of blobs. For example, 2 black blobs balance 1 white blob. Find out how many black blobs balance 2 white blobs. Build a number pattern. Then use the rule to solve a problem by moving blobs to make the scales balance. This learning object is the first in a series of three learning objects.