Decimal System

The standard numeral system using ten digits (0-9) where the value of each digit depends on its position, with each position representing a power of ten. Understanding the decimal system requires grasping place value — that the digit 4 represents different quantities in 400, 40, and 4. Learners with dyscalculia often struggle with place value concepts, making the decimal system particularly challenging. Accessible mathematics instruction may use visual or manipulative representations where magnitude is proportional to physical size, helping make the abstract positional notation more concrete.