Jordynne's Percent Post

Hello, you wonderful people! This is my really weird looking percent post. I hope this doesn't look too confusing...

1. Finding percents:

• 50%, you need to divide the whole by 2.
• 10%, divide the whole by 10.
• 1%, just divide the whole number by 100.
• 25%? Divide your whole by 4!

A percent is a fraction of a number and is out of 100. Even though some numbers are more or less than 100, 100% is always equivalent to that whole number.
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2.

• 180%

• 12 3/4%

• 0.7%

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3. 

• Converting 26% to decimals and fractions:

Decimals:

26% / 100 = 0.26

Fractions: 

26% / 100 = 0.26 

0.26 is in the hundredths place, so it would convert to 26/100 because the decimal is out of one hundred.

• Converting 7/10 to decimals and percents:

Decimal:

7 / 10 = 0.7

Percent:

0.7 x 100 = 70

• Converting 0.024 to fractions and percents:

Fractions: 0.024 is in the thousandths place, so it would convert to 24/1000 because 0.024 is out of 100.

Percent: 0.024 x 100 = 0.24

0.24 would convert to 24% because 0.24 is out of 100.

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4. 

• 20% of 60

Mental: 60 / 10 = 6

6 x 2 = 12

12 = 20%

Calculator: 20% x 100 = 0.2

0.2 x 60 = 12

• 0.1% of 40

Mental: 0.1% / 40 = 4

4 / 100 = 0.04 

Calculator: 0.1% / 100 = 0.001

0.001 x 40 = 0.04

• 250% of 400

Mental: 400 x 2 = 800

400 / 2 = 200

200 + 800 = 1000

Calculator: 250% / 100 = 2.5

2.5 x 400 = 1000

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5. #7, page 149

A herd of 100 caribou was moved to a new location. The population increased by 10% the first year, then increased by 20% the next year.

A) Find the population after the second year.

10% / 100 = 0.1

0.1 x 100 = 10

10 + 100 = 110

20% / 100 = 0.2

0.2 x 110 = 22

22 + 110 = 132

B) Explain why there was not a 30% increase in the population over the two years.

There wasn't a 30% increase in the population over the two years because after you add 10%, the whole number changes to 100 to 110, and then you add another 20% to 110. It's a completely different number with a completely different 20%. If you added 30% to 100, it would add up to 130, which is a different answer than 132.

Alright, I managed to find a really good video for converting fractions, decimals and percents. Hope it helps! :)