Gre Formula

Question 1

What is the percent change formula

Answer 1

Percent change= difference
—————— x 100
Original

Question 2

DIVISIBILITY

How to determine if a number is divisible by 2?

Answer 2

A number is divisible by two if the unit digit is divisible by two

Question 3

DIVISIBILITY

How to determine if a number is divisible by 3?

Answer 3

A number is divisible by three if the sum of the digits is divisible by 3

Ex 2,145 is divisible by 3 BC 2➕1➕4➕5= 12➗3

Question 4

DIVISIBILITY

How to determine if a number is divisible by 4?

Answer 4

A number is divisible by four if the last two digits from a number ➗ by 4️⃣
Ex: 712 is ➗4️⃣ bc 12➗4️⃣

Question 5

DIVISIBILITY

How to determine if a number is divisible by 5?

Answer 5

Any number is divisible by five if the unit is 0 or 5

Question 6

DIVISIBILITY

How to determine if a number is divisible by 6?

Answer 6

A number is divisible by six if it’s divisible by both 2(it’s even)and 3

Ex: 4,290 is divisible by 6 bc it’s divisible by 2 and by 3 bc 4➕2➕9➕0= 15/3

Question 7

DIVISIBILITY

How to determine if a number is divisible by 8?

Answer 7

A number is divisible by eight if the last three numbers form a number the visible by 8

Ex:11,640 is divisible by 8 bc 640 is divisible by 8

Question 8

DIVISIBILITY

How to determine if a number is divisible by 9?

Answer 8

A number divisible by nine if the sum of the digit is divisible by 9

Ex: 1➕8➕8➕1 = 18/9

Question 9

DIVISIBILITY

How to determine if a number is divisible by 10?

Answer 9

Her number is divisible by 10 if the unit is zero

Question 10

Vertical Angle

Answer 10

Vertical angles that cross each other when 2 angle intersect. Vertical angles are always equal.

                       X

If X was at the top it will be equal to Y below it

If A was to the left it would be equal to B to the right of it.

Question 11

Parallel Line

Answer 11

Parallel lines never intersect. When a pair of angles is intercepted by a third, the two types of angles are formed big and small angle. Big angles are equals to big angles and small angles is equal to small angles.
The sum of any big angle and any small angle will always equal 180

                Small           /   Big
                ——————/———————
                    Big        /  small 
                —————/————————
                               /

Question 12

The rules of 180°

Answer 12

Every triangle contains angle that adds up to 180

Question 13

What is an equilateral triangle🔼

Answer 13

An equilateral triangle is an angle in which all three sides are equal in length
Each angle = 60°
60*3= 180

                          60°

       60°.                              60°

Question 14

What is an isosceles triangle?

🔻

Answer 14

A triangle in which two of the three sides are equal in length which means that two of the angles are also equal

                          40°

                  70°.         70°

Question 15

Angle /side relationship and triangles

Answer 15

The longest side is opposite the largest internal angle( hypotenuse)

The shortest side is opposite the smallest internal angle

Equal sides are opposite.

Question 16

What is the perimeter of a triangle?

Answer 16

The perimeter of a triangle measure the distance around it.

All you have to do to find the perimeter of a triangle is add up the length of the sides

Question 17

What is that three side rules of a triangle?

Answer 17

The length of any one side of a triangle must be less than the sum of the other two size and greater than the difference between the other two sides.

    5.              

      X.               3

5+3=8
5-2=2
Therefore the third side must be between 2 and 8.

Question 18

Area of a triangle

Answer 18

A= 1/2 bh

The height of a triangle is defined as the length of a perpendicular line drawn from the point of the triangle to the base
              /\
             / l \
            /  I \
           /   l  \
          / h l   \
         /     l    \
         ———b

Question 19

What is the Pythagorean theorem

Answer 19

The theorem states that in a right triangle, the square of the length of the hypotenuse (the longest side) is equal to the sum of the square of the link of the two other side

a2➕b2= c2

a and b(other 2 sides)
C(length of the hypotenuse)

Question 20

What are the most common right triangles

Answer 20

3: 4:5
1. 3

                               5
           4

2. Double the ratio

6                              

                            10

  8

3. Triple the ratio

9

                            12

15

Question 21

What is the probability formula

Answer 21

Probability = desired outcome
—————————-
Total outcome

Ex: A bag contain 4 red balls, 3 orange balls, and 2 green balls. If three balls are chosen at random without replacement, what is the probability that all three balls are orange?

3 2 1. 1
— * — * — = ——
9 8 7. 84

Question 22

RATIOS

Answer 22

l X.   l.  Y l Z l Total l
————- l——-l——l-—l———l
 Ratio      l       l       l      l         l
————-l——-l——l—-l———l
 X           l        l       l     l         l
———— l——-l——l—-l———l
actual 
#

Question 23

Average formula

Answer 23

Total
➗——————————➗
I
l
# of. ✖️ Average
things l
I
l

Question 24

Rate/Distance/Time

Formula

Answer 24

Distance or Amount
➗——————————➗
I
l
Time ✖️ Rate
l
I
l

Question 25

F-R-O-Z-E-N

Answer 25

Fraction 
Repeat 
One
Zero 
Extreme
Negative

Question 26

Area of a rectangle

Answer 26

L x W = Area