Math Is Fun Forum

dollysaunder

Member

Registered: 2005-08-06

Posts: 3

Can Someone Please Tell me a Good Way to Remember Square Route? =-S

Help me please! i really need help! I alwats forget what square route is! and next year i'm going into Year 7 so i think that I really should know! please help me with a good strategy! If you don't have a strategy please tell me what it is! i just got retold last week! i have a horrible memory sometimes!

MathsIsFun

Administrator

Registered: 2005-01-21

Posts: 7,713

Re: Can Someone Please Tell me a Good Way to Remember Square Route? =-S

Are YOU asking, dollysaunder?

Anyway, square root is just the opposite of square.

To square a number is to multiply it by itself. The square of 5 is 5x5=25, so the square root of 25 is 5.

5   Squared ==>       25
5  <== Square Root   25

So, for example: what is the square root of 36 ???

*thinks* 6 x 6 = 36. (6 squared is 36)

Answer: the square root of 36 is 6

And if that fails then think of a square:

RRRR
RRRR
RRRR
RRRR

That square has 16 Rs in it, and it is 4 Rs wide by 4 Rs high.

So, 4 squared is 16.
And the square root of 16 is 4.

What is the square root of 81 ???

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"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

wcy

Member

Registered: 2005-08-04

Posts: 117

Re: Can Someone Please Tell me a Good Way to Remember Square Route? =-S

here are some tips to remember square root of large numbers..

you can break up the square root into two or more parts, eg

√36=√4 x √9 =2x3=6
that way, you need to remember less values
but this can only work for some numbers

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,395

Re: Can Someone Please Tell me a Good Way to Remember Square Route? =-S

Here are the squares and square roots of all squares up to 31.
1² = 1
2² = 4
3² = 9
4² = 16
5² = 25
6² = 36
7² = 49
8² = 64
9² = 81
10² = 100
11² = 121
12² = 144
13² = 169
14² = 256
15² = 225
16² = 256
17² = 289
18² = 324
19² = 361
20² = 400
21² = 441
22² = 484
23² = 529
24² = 576
25² = 625
26² = 676
27² = 729
28² = 784
29² = 841
30² = 900
31² = 961

Remember,
(1) The last digit of a perfect square is always 0, 1, 5, or 6.
(2) Finding square roots is easier by prime factorisation.
eg. 784 = 2 x 2 x 2 x 7 x 7 x 7
Therefore, the square root of 784 is 2 x 2 x 7, i.e. 28

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

John E. Franklin

Guest

Re: Can Someone Please Tell me a Good Way to Remember Square Route? =-S

To help jog your memory, visualize a tree with roots under the ground.

The roots are below the tree, so remember that the answer to a square root problem is usually smaller (roots below).

The square root of any number above one is going to be smaller than what you started with.

However, if you become a math wiz someday, you will learn that the square root of numbers between zero and one become bigger!

Good Luck!

aliya whyte

Guest

Re: Can Someone Please Tell me a Good Way to Remember Square Route? =-S

Help me please! i really need help! I alwats forget what square route is! and next year i'm going into Year11so i think that I really should know! please help me with a good strategy! If you don't have a strategy please tell me what it is! i just got retold last week! i have a horrible memory sometimes!

:( :(:( i neeed help with double digit and all the rest digit number. love aliya.