Praxis Elementary Education: Three Subject Bundle – Mathematics (5903) Practice Exam

Understanding how metric prefixes scale by powers of ten from largest to smallest helps you compare quantities quickly. Each step to the left increases by a factor of ten, and each step to the right decreases by a factor of ten. In this sequence, kilo is 10^3, hecto is 10^2, deka is 10^1, the base unit is 10^0, deci is 10^-1, centi is 10^-2, and milli is 10^-3. Because we move from the largest prefixed unit down to the smallest in that order, this sequence matches the largest-to-smallest progression. The base unit sits in the middle as the reference point, and prefixes such as giga or micro would extend the scale beyond what’s shown. That’s why this ordering is correct.