MODUL 1
Unit 2
OPERATION OF INTEGERS
A. Mental Mathematics
Mental mathematics or mental calculation is often used in daily life.
There are several techniques for doing calculations mentally.
1. Properties (commutative, associative, and distributive)
2. Compatible numbers
3. Compensation
4. Left-to-right methods
B. Estimation with integers
There are two types of computational estimation
Front-end Estimation and Rounding
Front-End Estimation
1. Range estimation
2. One-column
3. Two column front-end
4. Front-end with adjustment
Rounding
Rounding is the best known computational estimation technique.
The purpose of rounding is to replace complicated numbers with simpler numbers.
There are four types of rounding estimation
1.Round up ( down )
2.Round a 5 up
3.Round to the nearest even
4.Round to Compatible numbers
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………SUCCESS FOR YOU IS SUCCESS FOR US……।
Jumat, 26 September 2008
Minggu, 21 September 2008
INTEGERS AND THEIR SYMBOLS
INTEGERS AND THEIR SYMBOLS
MODUL 1
Unit 1
INTEGERS AND THEIR SYMBOLS
What are Integers?
If you look at thermometer, you will see that there are numbers such as 0, 5, 10, 15 and so forth on the thermometer scale. There are numbers above zero, and there are numbers below zero. The number below zero can be written or read as -5, -10, -15 and so on. Those numbers are called integers, the numbers greater than zero are called positive integers, and the numbers less than zero are called negative integers.
The numbers on some objects are written in a vertical number line, and on some other objects are in horizontal numbers line. The distance units from zero to 15 are the same as the distance from 0 to -15.
Two numbers are said opposite if they have the same distance from zero and have opposite directions on a number line. In a horizontal line, the number which has the symbol on the left side is always less than the number on the right side. Thus, 12 is greater than 10, it can written as 12 > 10.Because -10 on the left side of 10, -10 is less than 10, it can be written as -10 < 10.
See more………SUCCESS FOR YOU SUCCESS FOR US…….
MODUL 1
Unit 1
INTEGERS AND THEIR SYMBOLS
What are Integers?
If you look at thermometer, you will see that there are numbers such as 0, 5, 10, 15 and so forth on the thermometer scale. There are numbers above zero, and there are numbers below zero. The number below zero can be written or read as -5, -10, -15 and so on. Those numbers are called integers, the numbers greater than zero are called positive integers, and the numbers less than zero are called negative integers.
The numbers on some objects are written in a vertical number line, and on some other objects are in horizontal numbers line. The distance units from zero to 15 are the same as the distance from 0 to -15.
Two numbers are said opposite if they have the same distance from zero and have opposite directions on a number line. In a horizontal line, the number which has the symbol on the left side is always less than the number on the right side. Thus, 12 is greater than 10, it can written as 12 > 10.Because -10 on the left side of 10, -10 is less than 10, it can be written as -10 < 10.
See more………SUCCESS FOR YOU SUCCESS FOR US…….
Senin, 26 Mei 2008
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Get free content of this blog all.
See and write the URL http://cavitamath.blogspot.com/
I will give you tips and tricks , how to make mathematis so easily
You can get, tips and tricks, in Indonesian language by clik http://ariesvio.blogspot.com/
Thank you
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