Best Coaching academy for RMS- Sainik School Entrane Exam Preparation - www.sainikrimc.com

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094437 20076

Best Coaching academy for RMS- Sainik School Entrane Exam Preparation - www.sainikrimc.com
Mathematics  is one of the subjects were a candidate can score a perfect 100%
provided the candidate is well prepared and understands the questions asked.

 A systematic and  a logical approach is often required to solve maths problems

 Most of the arithmetic problems can be solved by using simple formula

 So the candidate must learn the formula its derivation and  commit it to the memory.

 some of the useful arithmetic formulas are given below:-

Basic math formulas

Find here a comprehensive list of basic math formulas commonly used when doing basic math computation





Average formula: 

Let a1,a2,a3,......,an be a set of numbers, average = (a1 + a2 + a3,+......+ an)/n

Fractions formulas: 

Converting an improper fraction to a mixed number:

Formula for a proportion: 

In a proportion, the product of the extremes (ad) equal the product of the means(bc), 

Thus, ad = bc

Percent: 

Percent to fraction: x% = x/100

Percentage formula: Rate/100 = Percentage/base

Rate: The percent. 
Base: The amount you are taking the percent of.
Percentage: The answer obtained by multiplying the base by the rate

Consumer math formulas: 

Discount = list price × discount rate

Sale price = list price − discount

Discount rate = discount ÷ list price

Sales tax = price of item × tax rate

Interest = principal × rate of interest × time

Tips = cost of meals × tip rate

Commission = cost of service × commission rate

Geometry formulas: 

Perimeter:

Perimeter of a square: s + s + s + s 
s:length of one side

Perimeter of a rectangle: l + w + l + w
l: length
w: width

Perimeter of a triangle: a + b + c
a, b, and c: lengths of the 3 sides

Area:

Area of a square: s × s 
s: length of one side

Area of a rectangle: l × w
l: length
w: width

Area of a triangle: (b × h)/2
b: length of base
h: length of height

Area of a trapezoid: (b1 + b2) × h/2
b1 and b2: parallel sides or the bases
h: length of height

volume:

Volume of a cube: s × s × s 
s: length of one side

Volume of a box: l × w × h
l: length
w: width
h: height

Volume of a sphere: (4/3) × pi × r3
pi: 3.14
r: radius of sphere

Volume of a triangular prism: area of triangle × Height = (1/2 base × height) × Height
base: length of the base of the triangle
height: height of the triangle
Height: height of the triangular prism

Volume of a cylinder:pi × r2 × Height
pi: 3.14
r: radius of the circle of the base
Height: height of the cylinder

we
at
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WRITTEN TEST COACHING
FOR SAINIK- RMS- RIMC
NDA- CDSE- TA- AFCAT
SSB - PSB- FSB
CALL 094437 20076

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