This math topic focuses on understanding percentages, specifically calculating the whole number from a given part and its percentage (all percentages being 10% multiples). It involves finding a number when a certain fraction (like 20% or 30%) of it is given. The problems include various examples with different numbers to reinforce the concept of calculating the base number from a percentage. Seven questions are presented, each with multiple-choice answers, providing practice on reverse calculations in percentage scenarios.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.