Printable calculating percentage worksheets | Helping with Math Calculating Percentage Values e.g. 225% of 45 = 101.25. Calculating using Percentage Values e.g. 72 is 25% of 288. Calculating Percentages in 2 Steps e.g. Finding 10% of a value and then multiplying to find 30%. Calculating Percentages in Steps e.g. Finding 35% by first finding 10%, then 30%, then 5%.