This math topic focuses on determining the whole number when given a specific value that represents a certain percentage of that number. The skill practiced involves finding the base number from a known percentage (30% and 10%), requiring an understanding of foundational percentage calculations. This activity is situated in a broader introductory unit on percentages and involves solving problems such as "18 is 30% of what number?" or "6 is 10% of what number?", with choices provided for each problem to select the correct answer.

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