math formulas

Question 1

Simple Interest rate

Answer 1

Interest= (principle)(rate)(time)

Principle is the amount of money initially invested or deposited
rate is annual interest rate
time is the time the money stays there

Question 2

Percent Increase Change

Answer 2

% change= change × 100 / original change

Question 3

Area of a Sector

Answer 3

X/360 times (πr²)

Question 4

Length of an arch

Answer 4

Question 5

Pythagorean triple

Answer 5

**3:4:5 **

5:12:13

8:15:17

7:24:25

Question 6

90,45,45 triangle

Answer 6

Question 7

90,60,30 Triangle

Answer 7

Question 8

Compound Interest

Answer 8

P = Principal

r = annual interest rate (as a decimal

c = number of “compoundings” per year

n = number of years

Question 9

sum of angels

Answer 9

180°(n-2)

Question 10

Given two sides of length a and b in a triangle

Answer 10

difference of a and b ∠ length of third side ∠ sum of a and b

A-B < C < A+B

Question 11

time

Answer 11

distance/rate

Question 12

Area of a Rhombus

Answer 12

Question 13

Avg. speed

Answer 13

Question 14

Distance between two points

Answer 14

Question 15

Distance

Answer 15

Rate x Time

Question 16

Time

Answer 16

distance / rate

Question 17

Slope

Answer 17

Question 18

Combination Formula

Answer 18

n being the number of items
r being the number of groups or combo// or objects that can be selected from n

Question 19

arranging objects when they are alike

(Mississippi Rule)

Answer 19

for instance Nanny

Question 20

Range

Answer 20

Max - Min

Question 21

Finding a certain sequence

Answer 21

Xn=3n+2

n being the value of the term in the order

For instance:
if n>0
we give n=1 to find the first term

Question 22

Permutation formula

Answer 22

Question 23

Percentages: % Decrease

Answer 23

(Amount of Decrease/ Original Whole) x 100%

Question 24

Percentages: % Increase

Answer 24

(Amount of Increase/ Original whole ) x 100%

Question 25

Percentages: New Whole

Answer 25

New Whole = Original Whole + or - Amount of Change

Question 26

The total number of primes from 1-100

Answer 26

25

Question 27

Sum of integers

Answer 27

Question 28

Converting fractions into decimals

Answer 28

Question 29

11²

Answer 29

121

Question 30

12²

Answer 30

144

Question 31

13²

Answer 31

169

Question 32

14²

Answer 32

196

Question 33

15²

Answer 33

225

Question 34

16²

Answer 34

256

Question 35

1/5

Answer 35

20%

0.2

Question 36

Fact about Remainder

Answer 36

Question 37

possible values of remainder

Answer 37

N and D are positive intergers. When N is divided by D the remainder is R. What are some possible values of N?

N ÷ D = Q(R)

Possible values of N:

R

R + D

R + 2D

R + 3D

….

Question 38

Surface area of a cylinder

Answer 38

Question 39

One feet is…

Answer 39

12 Inch

Question 40

Direct Variation

Answer 40

as X increases Y increases

2 bananas/ 1 $ = 5 bananas/ X

Question 41

Inverse variation

Answer 41

as x increases y decreases

(3 men) (2 hours) = (5 men)(x hours)

Question 42

Quadratic Formula

Answer 42

If (b²- 4ac) < 0 ==> then there is no solutions

Question 43

Probablity formula with OR

Answer 43

Question 44

Probabiltiy with AND

Answer 44

Question 45

Probability at least

Answer 45

Problem:

on fair dice is rolled 8 times. What is the probability of rolling at least one six?

Question 46

Greatest common factor of

x

Question 47

Facts about radicals

Answer 47