This math topic focuses on calculating the growth of money through simple interest, specifically concentrating on increments by 5% multiples. It involves finding the final amount when a principal sum has grown by 25% in interest. Each problem provides a starting principal amount (in dollars), and learners are required to calculate how much that amount increases when 25% interest is added. The topic is aimed at building fluency in understanding percent increase and its practical application in financial contexts like interest earnings.

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