Lawak jenaka maths...
Seorang cikgu masuk ke dalam bilik darjah.
Cikgu : Hari ini kita akan belajar mengira..
Murid-Murid : Baik cikgu..
Si guru mula bertanya kepada salah seorang muridnya, Ahmad
Cikgu : Ahmad, jika 1 biji timun ditambahkan 2 biji epal tambah 3 biji nenas dan 4 biji jambu jdi berapa...?
Ahmad : Jadi ROJAK cikgu..!! Nyam2..
Cikgu : Hah...??
April 5, 2010
DIRECTED NUMBERS
DIRECTED NUMBERS
The numbers which have a direction and a size are called directed numbers.
Multiplication and Division of Integers
MULTIPLICATION
RULE 1: The product of a positive integer and a negative integer is negative.
RULE 2: The product of two positive integers is positive.
RULE 3: The product of two negative integers is positive.
DIVISION
RULE 1: The quotient of a positive integer and a negative integer is negative
RULE 2: The quotient of two positive integers is positive.
RULE 3: The quotient of two negative integers is positive.
SUMMARY OF MULTIPLICATION AND DIVISION RULES
# If the signs are different the answer is negative.
# If the signs are alike the answer is positive
#
example (Multiplication)
Rule 1: 1. (+4) x (-2) = -8
2. (-2) x (+5) = -10
Rule 2: 1. (+6) x (+8) = +48
2. (+6) x (+2) = +12
Rule 3: 1. (-6) x (-8) = +48
2. (-2) x (-4) = +8
example ( Division):
Rule 1: 1. (-8) / (+4) = -2
2. (-12) / (+6) = -2
Rule 2: 1. (+6) / (-3) = -2
2. (+24) / (-6) = -4
Rule 3: 1. (+9) / (+3) = +3
2. (+16) / (+4) = +4
Rule 4: 1. (-6) / (-2) = +3
2. (-42) / (-7) = +6
The numbers which have a direction and a size are called directed numbers.
Multiplication and Division of Integers
MULTIPLICATION
RULE 1: The product of a positive integer and a negative integer is negative.
RULE 2: The product of two positive integers is positive.
RULE 3: The product of two negative integers is positive.
DIVISION
RULE 1: The quotient of a positive integer and a negative integer is negative
RULE 2: The quotient of two positive integers is positive.
RULE 3: The quotient of two negative integers is positive.
SUMMARY OF MULTIPLICATION AND DIVISION RULES
# If the signs are different the answer is negative.
# If the signs are alike the answer is positive
#
example (Multiplication)
Rule 1: 1. (+4) x (-2) = -8
2. (-2) x (+5) = -10
Rule 2: 1. (+6) x (+8) = +48
2. (+6) x (+2) = +12
Rule 3: 1. (-6) x (-8) = +48
2. (-2) x (-4) = +8
example ( Division):
Rule 1: 1. (-8) / (+4) = -2
2. (-12) / (+6) = -2
Rule 2: 1. (+6) / (-3) = -2
2. (+24) / (-6) = -4
Rule 3: 1. (+9) / (+3) = +3
2. (+16) / (+4) = +4
Rule 4: 1. (-6) / (-2) = +3
2. (-42) / (-7) = +6
SQUARES AND SQUARE ROOTS
SQUARES AND SQUARE ROOTS
HOW TO SQUARE A NUMBER???
HOW TO SQUARE A NUMBER???
To square a number, just multiply it by itself.
Example:
What is 3 squared?
3 x 3 = 9
"Squared" is often written as a little 2 like this:
42=16
2 is means squared
SQUARE ROOTS
A square root goes the other way:
3 squared is 9, so a square root of 9 is 3
A square root of a number is ...
... a value that can be multiplied by itself to give the original number.
A square root of 9 is ...
... 3, because when 3 is multiplied by itself you get 9.
The Square Root Symbol
This is the special
symbol that means "square root"
you would say "square root of 9 equals 3"