How to Calculate Percentages with a Calculator

Calculating percentages is an essential skill that is useful in various fields such as finance, business, and mathematics. While it is possible to manually calculate percentages, using a calculator can save time and provide accuracy. In this article, we will guide you on how to calculate percentages with a calculator effectively.

1. Percentage Increase/Decrease:

One common application of percentages is calculating the increase or decrease in value. To calculate the percentage increase or decrease, follow these steps:

a) Determine the original value and the new value.

b) Subtract the original value from the new value to find the difference.

c) Divide the difference by the original value.

d) Multiply the result by 100 to get the percentage increase or decrease.

Example: If the original value is 100 and the new value is 150, the calculation would be as follows:

Step 1: 150 – 100 = 50 (difference)
Step 2: 50 ÷ 100 = 0.5
Step 3: 0.5 × 100 = 50%

Therefore, the increase is 50%.

2. Percentage of a Number:

Another common calculation involving percentages is finding a certain percentage of a given number. To calculate the percentage of a number, follow these steps:

a) Determine the number you want to calculate the percentage of.

b) Multiply the number by the percentage value, expressed as a decimal or fraction.

Example: If you want to find 30% of 200, the calculation would be as follows:

Step 1: 200 × 0.30 = 60

Therefore, 30% of 200 is 60.

3. Percentage as a Proportion:

Calculating percentages as proportions is often used in various real-life situations. To calculate the percentage as a proportion, follow these steps:

a) Determine the number as a proportion of the whole.

b) Divide the number by the whole.

c) Multiply the result by 100 to get the percentage.

Example: If there are 25 girls in a class of 50 students, the calculation would be as follows:

Step 1: 25 ÷ 50 = 0.5
Step 2: 0.5 × 100 = 50

Therefore, the percentage of girls in the class is 50%.

4. Reverse Percentage:

Calculating reverse percentages involves finding the original value when the percentage increase or decrease and the final value are known. To calculate the reverse percentage, follow these steps:

a) Subtract the percentage increase or decrease from 100.

b) Divide the final value by the result obtained in step a.

c) Multiply the result by 100 to find the original value.

Example: If a product’s price increased by 20% and the final price is $120, the calculation would be as follows:

Step 1: 100 – 20 = 80
Step 2: 120 ÷ 80 = 1.5
Step 3: 1.5 × 100 = 150

Therefore, the original price was $150.

Calculating percentages with a calculator can save time, especially when dealing with complex calculations. By following these steps for different percentage calculations, you can ensure accurate results and gain a better understanding of percentages in various scenarios.

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