Percentages What are Percentages?. Percentages are measures out of a 100 Percentages.
Learn all about calculating percentages! Click on the Percent Symbol to enter!
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Transcript of Learn all about calculating percentages! Click on the Percent Symbol to enter!
Does percent mean “out of 100” or “out of 1000?”
75 out of how many would be 75%?
3/4 or 3÷4 equals 0.75 or 75%Does this give you a hint?
Click on the questions to answer them
If we read that about 1,900,643 out of 2,245,635 students liked to eat peanut butter and jelly, but only 12,635 out of 95,200 liked to eat brussel sprouts, we might say, “oh, let me think
about that…” or “What?!”
However, if we read that about 85% of students like peanut butter and jelly, but only about 13% like brussel sprouts, we would probably say – “well, yeah…duh!...of course!”
Percent can make big ratios easier to understand and talk about.
Let’s learn how to calculate percentages:
The trick is figuring out which numbers are the part, the whole and the percentage.
If you’re trying to find 75% of 80, it’s pretty easy to tell that 75 is the percent and 80 is the whole number.
How does this help?
You can use the same equation for calculating percentages no matter what you are trying to find! Percent x whole =
partSo…Is 80 the part or the whole when trying to solve “What is 75% of 80?”
Part Whole
Think about it. 75% is part of 100% and the question asks, 75% of 80 is ? So the number matched with 75% is the part and the percent matched with 80 is the 100%. 80 must be the whole.
Yes, 80 is the whole and we are
trying to find the part! So…
.75 x 80 = part
75% of 80 is:
24? 52?60?
Click on the correct answer
Let’s look at another kind of problem!
28 is 40% of what number?
Which equation(s) would be correct?
Remember – Percent x whole = part
28 ÷ .4 = ?
.4 × 28 = ? .4 × ? = 28
.4 x 28 is the expression for finding the part. In this case 28 is the part. 28 is 40% of what number? We are trying to find the whole!
Both the equation 28 ÷ .4 = ?
and the equation
.4 x ? = 28 are correct!
Percent x whole = part
Part ÷ whole = percent
Part ÷ percent = whole