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Sunday 10 January 2010

what is rounding?

Rounding is a way of simplifying numbers. If the driveway of a house is 5 metres and 7 cm long we would usually just say it is 5 m long.
Saying it's 5 m long will be close enough most of the time.

Here is another example. The picture shows a stick of rock next to a ruler. The ruler has only got the 10 cm points marked on it.

Fractions that equal one






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So if the number on the top of a fraction is the same as the number on the bottom then you have exactly one.

2/2 = 3/3 = 4/4 = 5/5 = 6/6 = 1

What is a fraction?

What is a fraction?

This pizza has been cut into three equal parts. We call these thirds. A third is written as 1/3.




The whole pizza cut into three equal parts gives us three thirds. Think about just one slice. We can write this using a fraction 1/3.



You might see fractions in shops, on bills, in newspapers and recipes. It's a good idea to recognise fractions when they are written as words.

fraction word plural
One half (A half) halves
One third thirds
One quarter quarters
One fifth fifths
One sixth sixths
One seventh sevenths
One eighth eighths
One ninth ninths
One tenth tenths
It's easy really to make the words, apart from the first four.All the other fractions are like the numbers but with a 'th' sound added at the end.

Even easier is making the plurals, as long as you are careful with the plural of .
Just put an 's' on the end of the other fractions.




words figures words figures
one quarter 1/4 three quarters 3/4
two fifths 2/5 three eighths 3/8
four fifths 4/5 two thirds 2/3

Difference Between Positive and Negative Integers

Zero IS an integer, but it is neither postive or negative. It is sometimes called "non-negative," but it is not positive. Positive integers are also called "natural" or "counting" numbers. You use them to count: 0,1,2,3,4,5... Negative integers are the "opposite" of counting numbers. The opposite of 1 is minus(negative) 1. The opposite of 2 is minus 2. And so on. These negative numbers are steps backwards on a number line.
Here are more opinions and answers from other FAQ Farmers:
An integer is any whole number that doesn't contain anything beyond (to the right of) the decimal point. Positive and Negative are adjectives that describe the integer. Positive means greater than or equal to 0 (eg. 0,1,2,3,4,5...) and negative means less than or equal to 0 (eg. 0,-1,-2,-3,-4,-5...). Negative integers are preceded with a "-" sign except for 0 because -0=0.

The set of positive integers and the set of negative integers when used by themselves act the same way under addition (they are just spelt a little differently)
3+3=6
-3-3=(-3)+(-3)=(-6)
They act differently under multiplication though.
4*5=20
(-4)*(-5)=20 (not -20)
but (-4)*5=4*(-5)=-20


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Integers


The integers are a special set of numbers often called whole numbers.
Whole numbers, however, consist of the counting numbers 1,2,3,4,5,6,7,8,9,10,11,..
along with zero. The integers is a larger set because it includes the negatives of
the counting numbers-1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, ...
Integers form an algebraic group under addition and are closed under multiplication.
The integers are the natural numbers (also called counting numbers) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, ... and their negatives -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, ... and 0.
Zero is the additive identity and for any integer x its additive inverse is -x (i.e. x - x = x + (-x) = (-x) + x = 0).
Also -(-x)=x

Negative Numbers : Intro (LW)





In this section we will see how our number system can be extended to include negative numbers.
Look at the number line below:



The numbers to the left of zero are negative and the numbers to the right of zero are positive.



If we have two numbers, we say that one is less than the other if it is further left on the number line.
For example, "2 is less than 7" because 2 is further left. This can also be written as "2 < 7".




We say that one number is greater than another if it is further right on the number line.
For example, "3 is greater than -5" because 3 is further right. This can also be written as "3 > - 5".



http://www.cimt.plymouth.ac.uk/projects/mepres/book7/bk7i3/bk7_3i3.htm


cool...

Add and Subtract Positive and Negative Numbers

Addition of negative numbers

3 Arithmetic
3.17 Addition of negative numbers
Now think about adding a negative number, by looking at the number line again. Suppose you start at 0. Since 0 + −3 is the same as −3, you would expect that adding −3 to 0 on the number line should take you to the point marked −3 on the number line. So, 0 + −3 = −3.

Suppose Thomas's piggy bank were empty and he added an IOU for £3 to it. The value of the piggy bank would be −3.




To reach −3 from 0, move 3 units to the left. In general to add a negative number you move to the left along the number line.#



source

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Hari ini atau esok kita pasti berhijrah. Atau esok-esok! Ia bukan suatu perkara yang pelik!


http://muhdkamil.net/kehidupan/2010/01/10/singkat/

the decimal point

The zero and the counting numbers (1,2,3,...) make up the set of whole numbers. But not every number is a whole number. Our decimal system lets us write numbers of all types and sizes, using a clever symbol called the decimal point.

As you move right from the decimal point, each place value is divided by 10.




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The symbol used to separate the integer part of a decimal number from its fractional part is called the decimal point. In the United States, the decimal point is denoted with a period (e.g., 3.1415), whereas a raised period is used in Britain (e.g., ), and a decimal comma is used in continental Europe (e.g., 3,1415). The number 3.1415 is voiced "three point one four one five," while in continental Europe, 3,1415 would be voiced "three comma one four one five."

Multiplying by a power of 10, i.e., , is equivalent to moving a decimal point digits to the right, and dividing by is equivalent to moving a decimal point digits to the left. So, for example, , while .

Similarly, multiplying by a power of , i.e., , in base is equivalent to moving the "-ary point" digits to the right. For example, in binary (), , so .

what is decimal?

source



decimal fraction: a proper fraction whose denominator is a power of 10
a number in the decimal system
wordnetweb.princeton.edu/perl/webwn


The decimal (base ten or occasionally denary) numeral system has ten as its base. It is the most widely used numeral system.
en.wikipedia.org/wiki/Decimal


A decimal (also spelled decimel) is an obsolete unit of area in India and Bangladesh approximately equal to 1/100 acre (40.46 m²). ...
en.wikipedia.org/wiki/Decimal_(unit)


The number system that uses the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9; A number expressed in this system; A decimal place; Concerning numbers ...
en.wiktionary.org/wiki/decimal


decimals - The number of places to the right of a decimal point.
dnr.alaska.gov/ssd/lris/gis/documentation/data/glossary.html


a number represented as a whole number and some fractional part as well. Decimal numbers either take up more memory than integers, or are accurate ...
www.intap.net/~drw/cpp/glossary.htm


Refers to a base ten number system using the characters 0 through 9 to represent values.
weedinstrument.com/info_central/glossary/d.php


the first experiments with the decimal scale were performed by Constantine Hering in 1833. 1 part medicinal substance (dry or tincture), mixed ...
www.wholehealthnow.com/homeopathy_pro/pro_glossary.html


A real number on the base ten standard numbering system.
math.about.com/library/bld.htm


A decimal variable holds a number as a sequence of digits and is therefore precise, unlike a floating-point number. However, there is a limit on the number of digits.
msdn.microsoft.com/en-us/library/bb483022.aspx


A system of counting using ten digits, "0" through "9" (base 10). Most of the Western world uses this system.
apple2history.org/history/glossary.html


Synonym of denary.
www.geocities.com/andrewbroad/spectrum/willy/glossary.html
(1) A number that uses place value and a decimal point to show tenths, hundredths, thousandths and so on.
www.ovec.org/esl/MIDDLE%20SCHOOL%20MATH.doc



or decimal fraction (p. 41) is based on tens. Only 10 and powers of ten are denominators. fractional part . whole number
math.pghboe.net/econnectedmath/adaptations/Bits%20and%20Pieces%20I/bits-vocab.doc



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that is a lot