Multi-base arithmetic blocks for base 2 (Two Land) and base 3 (Three Land) out to seven places. Scored to illustrate the structure of a place value numeration system: that a base 2 system is literally based, or built, on 2. Each digit to the immediate left of another digit is exactly twice the value of that digit. This relationship is shown with the red or Two Land blocks by having two the same make the next bigger block. Likewise, a base 3 numeration system is literally based, or built, on 3. Each digit to the immediate left of another digit is exactly thrice (three times) the value of that digit. This relationship is shown with the blue or Three Land blocks by having three the same make the next bigger block. Suitable for all grades.

An individual set of Fair Lands™ blocks consists of the following:

• Base 2 or Two Land blocks: 8 unit cubes, 5 longs, 4 flats, 3 super cubes, 3 super longs, 3 super flats, and 1 mega cube (27 blocks total) from 1 cubic centimeter to 4 cubic centimeters by doubling.
• Base 3 or Three Land blocks: 10 unit cubes, 6 longs, 5 flats, 5 super cubes, 5 super longs, 5 super flats, and 1 mega cube (37 blocks total) from 1 cubic centimeter to 9 cubic centimeters by tripling.