Math Concepts Flashcards
Is zero even or odd? Positive or negative?
Even
Neither positive nor negative
Are fractions positive or negative?
Neither
Prime #s through 30
2,3,5,7,11,13,17,19,23,29
How should you solve 12a+4a?
pull out 4… 4(3a+a)
How should you solve 15^12 - 15^11?
15^11(15 - 1)
If x^2=16, then x?
4 or -4
square root of 1 equals
1
square root of 2 equals
1.4
square root of 3 equals
1.7
square root of 4 equals
2
converting mixed numbers
2 2/3 = ?
multiply whole number by the denominator and put that number on top of the denominator. add this new fraction to the original fraction
2 2/3… multiple 2 x 3= 6… 6/3…. 6/3 + 2/3 = 8/3
.35 is what percent of 100?
35%
formula for percent change
(change/original) x 100
Proportions
60 min/$7.20 = 10 min/$X
cross multiply
Permutations
Order matters
How many ways can you arrange 5 statues?
5 x 4 x 3 x2 x 1 =120
5 people run a race. how many ways can the 3 medals be given?
5 x 4 x 3= 60
Combinations
Order doesn’t matter
There are 5 types of ice cream. How many ways can three flavors be together on a cone?
5 x 4 x 3/ 3 x 2 x 1 = 10
numerator is the number of spots filled by the number of options, and the denominator is the factorial of the number of spots
Averages Box
sum # of things average
Rate Box
distance/amount
time rate
45-45-90 triangle sides
X - X - Xradical2
30-60-90 triangle sides
X - Xradical 3 - 2X
area of a circle
apple pies are too
a= πr^2
