|
|
Home » Maths Tricks » Squaring Numbers In The Four Hundreds |
|
|
|
Maths Tricks of Squaring Numbers In The Four Hundreds |
|
Squaring numbers in the four hundreds |
Choose a number in the 400s (keep the numbers low at first; then progress to larger ones). The first two digits of the square are 16: 1 6 _ _ _ _ The next two digits will be 8 times the last 2 digits: _ _ X X _ _ The last two places will be the square of the last two digits: _ _ _ _ X X Example: If the number to be squared is 407: The first two digits are 16: 1 6 _ _ _ _ The next two digits are 8 times the last 2 digits: 8 x 7 = 56: _ _ 5 6 _ _ Square the last digit: 7 x 7 = 49: _ _ _ 4 9 So 407 x 407 = 165,649.
For larger numbers reverse the steps:
Square the last two digits (keep the carry): _ _ _ _ X X 8 times the last two digits + carry: _ _ X X _ _ 16 + carry: X X _ _ _ _
See the pattern?
If the number to be squared is 425: Square the last two digits (keep the carry): 25 x 25 = 625 (keep 6): _ _ _ _ 2 5 8 times the last two digits + carry: 8 x 25 = 200; 200 + 6 = 206 (keep 2): _ _ 0 6 _ _ 16 + carry: 16 + 2 = 18: 1 8 _ _ _ _ So 425 x 425 = 180,625.
|
|
|
|
 | Dictionaries |  |
|
Dictionary of Chemical Terms
|
 | Look up unfamiliar chemistry terms....
Click on the first letter of the word you would like to look up
|
Plasma Dictionary |
 |
The Plasma Dictionary is based on the Fusion & Plasma Glossary that was originally created on FusEdWeb, Fusion Energy Educational Website which has additional introductory information on plasma and fusion science . Click on the first letter of the word you would like to look up
|
Planet Dictionary |
 |
A planet (from the Greek planete means "wanderer" or
more forcefully "vagrant, tramp") is an object in orbit around a star
that is not a star in its own right. Much like "continent," "planet"
is a word without a precise definition, with history and culture playing
as much of a role as geology and astrophysics
Click on the first letter of the word you would like to look up
|
Computer Abbreviations Dictionary |
 | Searchable glossary of computer and Internet words, acronyms, and abbreviations.
Click on the first letter of the word you would like to look up
|
Dictionary of Chemical Terminology |
 | This is a "living glossary". This means that the glossary may grow every week as individuals submit new entries. This has been set up as a class resource for CEM-181H, the freshmen honors chemistry lecture at Michigan State University.
Click on the first letter of the word you would like to look up
|
Dictionary of Commonly Confused Words |
 | The Wrong Word Dictionary : Most Commonly Confused Words · The Words Almost Everyone Confuses and Misuses .
Click on the first letter of the word you would like to look up
|
Dictionary of Geology |
 |
A science that deals with the history of the earth as recorded in rocks.
Click on the first letter of the word you would like to look up
|
|
|
|
 |
News |
 |
|
|
|
|
(You Can browse United States School Name,Address,Email,Telephone No. Director name and many more Information by State and City Wise)
|
|
|
|
|
|
(You Can browse United States Public Library Name,Address,Email,Telephone No. Director name and many more Information by State and City Wise) |
|
|
|
|
(You Can browse World Occupational Wages Information by Country Wise) |
|
|
|
|
(Contains the records of all U.S. Civil Aircraft maintained
by the FAA, Civil Aviation Registry, Aircraft Registration Branch,
AFS-750.)
|
|
|
|