![]() Apply rules: calculate a rough estimate of both componentsģ. Round numbers: round $69 to $70 and round 18% (15% + 3%) for ease.Ģ. ![]() Break down complex percentages into simpler components and sum their results.Įxample: What is roughly 18% of a $69 purchase?ġ. Apply rules like half (50%), double (200%), etc., as appropriate.ģ. Round numbers to be easier to work with.Ģ. Sometimes it’s possible to make quick mental approximations when calculating percentages:ġ. ![]() Move the decimal one position to the left: 200 becomes 20. Move the decimal point to the left according to the number of zeros.Ģ. Find the number of zeros in the percentage (this is the same as the number of 10s which comprise that percentage).Ģ. The process involves moving the decimal point in your number.ġ. Using the rule of tens, you can quickly calculate percentages that are divisible by 10. Multiply that decimal with the required number: (0.4) x (150) = 60. Convert the percentage into a decimal: 40 ÷100 = 0.4.Ģ. Multiply that decimal by the number you need to find the percentage of.ġ. Convert the percentage to a decimal by dividing it by 100.Ģ. The fraction for 25% is 25/100 or 1/4.Ĭonverting a percentage into a decimal allows you to use straightforward multiplication to find the result:ġ. Multiply the simplified fraction by the number you need to find the percentage of.ġ. Determine the fraction that represents the percentage.ģ. You can use it when you’re trying to figure out simple percentages without having to do any complex mathematical functions.ġ. This method involves comparing numbers and their relative proportions to one another. In this article, we’ll cover several methods that can help you master the art of quick percentage calculations with ease. Often we need to calculate percentages quickly – whether it’s determining discounts while shopping, evaluating a sports team’s success rate, or figuring out how much to tip at a restaurant. Percentages are essential in everyday life, as they help us make sense of various proportions and understand numerical relationships.
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