Percent
What is the percent formula?
How much is 15 percent of 20? correct answers Percent Formula:Part = Percent x Whole
For example, 15% of 20 is:
15/100∗20 = 300/100=3
Percent 2
What is the formula for percent change?
If Jack got a raise from $15 per hour to $18
per hour,...
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Percent
What is the percent formula?
How much is 15 percent of 20? correct answers Percent Formula:Part = Percent x Whole
For example, 15% of 20 is:
15/100∗20 = 300/100=3
Percent 2
What is the formula for percent change?
If Jack got a raise from $15 per hour to $18
per hour, what was the percent increase? correct answers Percent Change Formula:
𝑎𝑚𝑜𝑢𝑛𝑡 𝑜𝑓 𝑐h𝑎𝑛𝑔𝑒/𝑜𝑟𝑖𝑔𝑖𝑛𝑎𝑙 𝑎𝑚𝑜𝑢𝑛𝑡× 100%
Jack's Raise:
(18 − 15)/15 × 100% = 3/15 × 100% = 100/5 = 20%
! Make sure you use the original amount (15), not
the new one (18)
Percent 3
If the production of hybrid cars tripled last year, by how many percent did it increase?
a.100%
b.200%
c.250%
d.300%
e.333% correct answers The correct answer is B - increased by 200%
For example, if production was 10 cars, and it
tripled to 30 cars, the increase was 20 cars, which
is 200% of 10
Percent 4
50% of 25 is 25% of which number? correct answers There are 2 solutions to this problem: Long one: 50% of 25 is 12.5 12.5 *100 = x * 25 x = 50 Short one but a harder to come up with: 50% * 25 = x * 25% 50 = x
Odd/Even Rules
Check your knowledge of Odd/Even rules Odd + Odd = ? Odd - Even = ? Even + Odd = ? Odd x Odd = ? Odd ÷ Even = ? Odd x Even = ?
Hint: try picking numbers correct answers Odd + Odd = 1+ 1 = 2 (Even) Odd - Even = 3 - 2 = 1 (Odd) Even + Odd = 2 + 1 = 3 (Odd) Odd x Odd = 3 x 3 = 9 (Odd) Odd ÷ Even = 3 ÷ 2 = 1.5 (Not an integer!) Odd x Even = 3 x 2 = 6 (Even)
Odd/Even Rules 2
Is 0 odd or even? correct answers 0 (zero) is Even It is also not positive or negative- it is neutral
Odd/Even Rules 3
If b is an odd number, which of the following
must be even?
A. 2𝑏 − 3
B. (𝑏-1)/2
C. (𝑏/2)− 1
D. 𝑏^2 + 2
E. 2𝑏 + 2 correct answers Use the "plug numbers" method to check each
answer choice. Let's take 1:
A. 2*1 - 3 = -1 (Odd)
B.(1-1)/2= 0 (Even) - however, just in case, lets try 3.
(3-1)/2= 1 (Odd). It usually is a good idea to run
through 2 different numbers if you get zero or similar
C.(1/2)−1 = −1/2(not an intenger)
D. 1 + 2 = 3 (Odd)
E. 2 + 2 = 4 (Even)
Odd/Even Rules 4
Is A+B+C even or odd?
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