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telo118 [61]
3 years ago
12

How do you find percent of a number mentally

Mathematics
2 answers:
ycow [4]3 years ago
6 0
Percentage of a number using mental math. Learn how to solve percent problems in your head! Since 10% is 1/10, and it's so easy to find 1/10 of any number, we can use that to quickly calculate certain percentages of quantities in our heads. to find 20% of a number, first find 10% of it, and double that.
olga55 [171]3 years ago
5 0
It isn't easy really but you can always divide the number out. For example 50% of 200 is 100 by dividing 200 by 2 or 25% of 100 is 25 by dividing 100 by 4 since 25% is equivalent to 1/4
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Evaluate the following if k=0.5, n=-3, and p=-2: K+n(p^2)​
ivann1987 [24]

Answer:

-11.5

Step-by-step explanation:

K + n( {p}^{2} ) \\  \\ plug \: K = 0.5, \: n =  - 3, \: p =  - 2 \\  \\ K + n( {p}^{2} )  \\  \\  = 0.5 + ( - 3) \{ {( - 2)}^{2}  \} \\  \\  = 0.5 - 3 \{ 4 \} \\  \\  = 0.5 - 12 \\  \\  =  - 11.5

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3 years ago
Find the number that makes the ratio equivalent to 1:4.
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8:2 hope this helps
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3 years ago
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dezoksy [38]

Answer:

$20,800

Step-by-step explanation:

There are 52 weeks in a year, therefore, do 100 x 52 = $5,200

You earn $5,200 a year, for 4 years so do 5,200 x 4 = $20,800

6 0
2 years ago
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SVETLANKA909090 [29]

Answer:

1. one quarter and one nickel

2. two dimes and two nickels

3. one dime, two nickels, and ten pennies

Step-by-step explanation:

(Assuming you mean U.S.A. money)

30% of a dollar equals 30 cents. Each of the above equals 30 cents.

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3 years ago
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The cost of the apple is expressed as y = 12x + 6, where x is the number of apples. Find the cost of dozen apples.
astra-53 [7]

Answer:

<h2>             150</h2>

Step-by-step explanation:

x = dozen = 12

12x + 6 = 12•12 + 6 = 144 + 6 = 150

8 0
3 years ago
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