#### Halloween 2024: Mystery Coloring and Graphing Activities!

Oct 16, 2024 |

We’re getting ready for a spooktacular Halloween with some math-y at-home activities!

Apr 22, 2014

Given a percentage of a number, how do you find 100%? We'll show you different ways to find 100%.

First, remember that 100% means "all of it... the whole thing."

This question asks, "If 25% of a number is 5, then what is 100% of the number (the whole thing)?"

The strategy here is to see how many times the "percent number" (in this case, 25) goes into 100, and then count by that number until we reach 100-the whole thing.

Here, we're told that 25% of a number is 5. So, to find 100% of the number, we count by **25s** up to 100: **25, 50, 75, 100**.

25% is 5, so

50% is 10,

75% is 15, and

If 20% of his money is $10.00, then 40% is $20.00. (20% + 20% = 40%)

Similarly, 60% is $30.00 (40% + 20% = 60%), 80% is $40.00, so 100% is **$50.00**-the amount of money the man had to start.

Here's an even faster way to approach this problem. There are 5 20%s in 100%, so this problem calls for five sets of $10.00, which equals **$50.00**.

Here, 5% is 10 kids. Since there are 20 5s in 100, we multiply 20 by 10 and get **200**, the total number of students at the school.

- 10% of what number is 8?
- 20% of what number is 4?
- 20% of what number is 6?
- 50% of what number is 28?
- 5% of what number is 11?
- 1% of what number is 2?

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