1. Addition of 5
When adding 5 to a digit greater than 5, it is easier to first subtract 5 and then add 10.
For example,
8 + 5 = 13.
Also 8 - 5 = 3; 3 + 10 = 13.
12 + 5 = 17.
Also 12 - 5 = 7; 7 + 10 = 17.
2. Subtraction of 5
When subtracting 5 from a number ending with a a digit smaller than 5, it is easier to first add 5 and then subtract 10.
For example,
26 - 5 = 21.
Also 26 + 5 = 31; 31 - 10 = 18.
23 - 5 = 18.
Also 23 + 5 = 28; 28 - 10 = 18.
23 - 5 = 18.
Also 23 + 5 = 28; 28 - 10 = 18.
Division by 5
Similarly, it's often more convenient instead to multiply first by 2 and then divide by 10.
For example,
1375/5 = 2750/10 = 275.
980/5 = 1960/10 = 196.
Multiplication by 5
It's often more convenient instead of multiplying by 5 to multiply first by 10 and then divide by 2.
For example,
140×5...
Basic statistics formulas
Statistics is a mathematical science pertaining to the collection, analysis, interpretation, and presentation of data. It is applicable to a wide variety of academic disciplines, from the physical and social sciences to the humanities; it is also used and misused for making informed decisions in all areas of business and government. (wikipedia.org)
its include histogram graphics theory, probability, ANOVA, Summarizing data, deviation, Correlation and causation, etc.
Download Basic Statistics Formula ListBasic Statistics 1it include : Measures of Location, Sets, Probability, Measures of spread, deviation, Normal density function, Confidence intervals for the mean, Hypothesis test for the mean , and Simple linear regression
Basic Practice of Statistics
it include : Exploring Data: Distributions,...
Trygonometric Delights, and introduction of trygonometry free books
in this post I provide a simple review of the two free books that I found after browsing about trigonometry, there is no end to the discussion of the triangle, we can explore a part of this mathematics ranging from history, until a new theory about the true triangle, two books that can be download for free following a discussion about two different things but actually interrelated, the first book can be downloaded at the following link
Trigonometric DelightsThis Book Begins by examining the "proto-trigonometry" of the Egyptian pyramid builders. It shows how Greek astronomers developed the first true trigonometry. It traces the Slow Emergence of modern, analytical trigonometry, recounting its Origins in Renaissance Europe's quest for more accurate Artillery, more precise clocks, and more pleasing...
Best mathematics Integral help website
Integration is an important concept in mathematics and, together with differentiation, is one of the two main operations in calculus. Given a function ƒ of a real variable x and an interval [a, b] of the real line, the definite integral.
to learn more about integral, here i write some list that i think best online help of integral.
1. Wolfram Integral
http://integrals.wolfram.com/index.jsp
The Wolfram Mathematica Online Integrator is powered by webMathematica, so it expects input to be in Mathematica syntax, it very easy to solve integral problem, just write your mathematics integral then click Compute, the results will display in a second.
before write your mathematics expression, learn the expression and syntax first
2.Edu Media
http://www.edumedia-sciences.com/en/a357-integral
this website...
best online calculus help website
various online help of calculus available in internet, every those website have their advantage, we can choose which website that can fit with what we need.below some list calculus website with their unique facilities1. http://www.calculus-help.com/this website provide various facilities with unique multimedia tutorial, problem's this week can become interactive tutorial source, available from 1998 until 2003,you can see those example at http://www.calculus-help.com/oldproblems.htmlother interactive multimedia tutorial available at calculus phobe, Understanding that enormous tome is just as plausible as whittling a canoe from a giant redwood tree. Welcome to your oasis of understanding. The tutorials that follow explain calculus audio-visually, and are the equivalent of a personal tutoring...
Linear Methods of Applied Mathematics free book
Linear Methods of Applied MathematicsOrthogonal series, boundary-value problems, and integral operatorsEvans M. Harrell II and James V. Herod © Copyright 1994,1995,1996, 1997, 2000 by Evans M. HarrellII and James V. Herod. All rights reserved.This is a WWW textbook written by Evans M. Harrell II and James V. Herod, both of Georgia Tech. It is suitable for a first course on partial differential equations,Fourier series and special functions, and integral equations. Students are expectedto have completed two years of calculus and an introduction to ordinary differential equations and vector spaces. For recommended 10-week and15-week syllabuses, read thepreface.This text concentrates on mathematical concepts rather than on details of calculations, which are often done with software, such...
Multivariable Calculus
This is a textbook for a course in multivariable calculus. It has been used for the past few years here at Georgia Tech. The notes are available as Adobe Acrobat documents,this book also available online at http://www.math.gatech.edu/~cain/notes/calculus.html, written by George Cain and James HerodTitle page and Table of Contents Table of Contents Chapter One - Euclidean Three Space 1.1 Introduction 1.2 Coordinates in Three-Space 1.3 Some Geometry 1.4 Some More Geometry--Level Sets Chapter Two - Vectors--Algebra and Geometry 2.1 Vectors 2.2 Scalar Product 2.3 Vector Product Chapter Three - Vector Functions 3.1 Relations and Functions 3.2 Vector Functions 3.3 Limits and Continuity Chapter Four - Derivatives 4.1 Derivatives 4.2 Geometry...