8 Grade Math Formula Chart

Grade 8^th Math formula chart provides complete solution towards solving the problem using formulas.

By simply substituting the data into the formula the unknown values can be found. Formulas are given based on the syllabus of the 8^th class board.

Grade 8 Math formula:
A list of formulas for 8^th grade class are given in pdf form for easy memorization and better understanding of the subject .

Geometry Figure	Area	Perimeter
Triangle	12 bh	a+b+c	b= breadth  h = height  a,b,c sides of triangle
Rectangle	bh	2l + 2w	w = width
Square	s2		S = side of square
Parallelogram	bh
Circle	πr2		r = radius
Trapezoid	12 (b1+b2)h
Three-Dimensional Figure	surface area	Lateral surface area
Rectangular prism	2ab+2bc+2ca
Cylinder	2πrh
Cube	6a2
Sphere	4πr2
Prism		ph	P = perimeter
Pyramid		12 pl+b
Cylinder		2πrh

Algebraic  Expansions:

(a + b)² = a² + b² + 2ab

(a - b)² = a² + b² - 2ab

( a² - b²) = ( a + b)  ( a - b)

( a + b + c)² = a² + b² + c² + 2ab + 2bc + 2ca

( a + b - c)² = a² + b² + c² + 2ab - 2bc -2ca

Simple Interest = PTR100P = principal,T = time ,R = rate of interest

Customary Conversions :

1 mile = 5,280 feet (ft)

1 yard (yd) = 3 feet

1 foot = 12 inches (in.)

1 ton (T) = 2,000 pounds (lb)

1 pound = 16 ounces (oz.)

1 gallon (gal) = 4 quarts (qt)

1 quart = 2 pints (pt)

1 pint = 2 cups (c)

1 cup = 8 fluid ounces

1 day = 24 hours (hr)

1 hour = 60 minutes (min)

1 minute = 60 seconds (sec)

Metric Conversions :

1 kilometer = 1000 meters

1 hectometer = 100 meters

1 decimeter = 0.1 meter

1 centimeter = 0.01 meter

1 millimeter = 0.001 meter

1 meter = 100 cm = 10 dm = 0.01 m

Pythagorean Theorem:
a² + b²  = c²

Laws of Exponents
Quotient Law: aman=am−n, if m > n
              = 1an−m, if n > m

Power law: (a^m)ⁿ = a^mn

Product law: a^m*aⁿ = a^m+n