The best of resources for understanding and reasoning about units, tens, hundreds, and thousands. It includes 100 units, 10 tens, 10 hundreds and 1 thousand. Essential for number decomposition, comparisons and equivalences between unit / ten / hundred / thousand, and the first basic mathematical operations (addition / subtraction / multiplication). The individual cubes measure 1cm3. The work cards have a growing level of difficulty and are numbered for each series from 1 to 4. They allow the use of the material throughout the school year with children at different levels.