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Imagine you predicted something (like how many cookies you'd bake) and the actual result was different. Percent error tells you how far off you were. Here's the formula (don't worry, it's easier than it looks!):
Percent change helps you see how something has increased or decreased over time. Imagine you had a collection of 100 marbles, and now you have 120. The percent change is:
So, in this case, the change is positive (more marbles). This formula works for both increases and decreases, as long as you keep track of positive and negative signs.
Detailed Steps:
Step 1: Subtract the original value from the new value.
Step 2: Divide this result by the original value.
Step 3: Multiply by 100 to find the percent change.
For instance, if a stock price goes from $100 to $110, the percent change is ((110 - 100) / 100) × 100 = 10%.
Finding the percent of a number involves a simple multiplication.
Step 1: Convert the percentage you want to find into a decimal by dividing it by 100.
Step 2: Multiply the decimal by the number in question.
For example, to find 25% of 200, first convert 25% to 0.25 and then multiply 0.25 by 200 to get 50.
To find 40 percent of 20:
Step 1: Convert 40% to a decimal (0.40).
Step 2: Multiply 0.40 by 20.
0.40 × 20 = 8. So, 40 percent of 20 is 8.
To calculate 20 percent of 40:
Step 1: Convert 20% to a decimal (0.20).
Step 2: Multiply 0.20 by 40.
0.20 × 40 = 8. Therefore, 20 percent of 40 is 8.
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