THE NATURAL NUMBERS : THE NATURAL NUMBERS N
0, 1, 2, 3, 4. . .
REMEMBER : REMEMBER 0
zero
1 2 3 4 5
one two three four five
6 7 8 9 10
six seven eight nine ten
Slide 3 : 11 12 13 14 15
Eleven Twelve Thirteen Fourteen Fifteen
16 17 18 19 20
Sixteen Seventeen Eighteen Nineteen Twenty
21 22 23 . . .
Twenty-one Twenty-two Twenty-three . . .
Slide 4 : 30 Thirty
40 Forty
50 Fifty
60 Sixty
70 Seventy
80 Eighty
90 Ninety
100 A Hundred
1 000 A Thousand
1 000 000 A Million
1 000 000 000 A Billion
Operations : Operations 5 + 3 Five plus three
8 – 3 Eight minus three
6 x 2 Six times two
15 / 3 Fifteen divided by three
Comparisons : Comparisons 7 > 5 Seven is greater than five
5 < 7 Five is less than seven
3 = 3 Three is equal to three
1.- EVOLUTION OF NUMBERS : 1.- EVOLUTION OF NUMBERS The numbers appeared due to the necessity of counting.
Primitive societies created symbols to express
quantities like how many animals they had hunted. They made marks on bones and on stones.
The Egyptians used these symbols:
ONE TEN A HUNDRED A THOUSAND
What quantity is written on the stone? : What quantity is written on the stone?
. : . Are you sure that you are right?
Yes, you are. The quantity is 1,435
Slide 10 : As you know, The Romans used this letters:
I V X L
One Five Ten Fifty
C D M
A Hundred Five Hundred A Thousand
What quantities are written? : What quantities are written? a) MVI
b) CXLII
What quantities are written? : What quantities are written? a) MVI 1 006
b) CXLII 142
Slide 13 : a) M = 1000
V = 5
I = 1
MVI = 1006
b) C = 100
X = 10
L = 50
I I = 2
CXLII = 142
Note: Remember to subtract when the smaller number is
on the left.
1.- THE NATURAL NUMBER SET : 1.- THE NATURAL NUMBER SET The Natural Number Set is represented with the letter N
N = { 0, 1, 2, 3, ... }
Operations
Addition
2314 + 25 = ?
Slide 15 : Remember when writing:
* Unities under unities
* Ten unities under ten unities
* Hundred under hundred
2. Subtraction: : Remember when writing:
* Unities under unities
* Ten unities under ten unities
* Hundred under hundred 2. Subtraction:
3. Multiplication: : Remember when writing:
* Unities under unities
* Ten unities under ten unities
* Hundred under hundred 3. Multiplication:
4. Division: : 4. Division: Remember:
Dividend = 726
Divisor = 23
Quotient = 31
Remainder = 3 Dividend = Divisor x Quotient + Remainder
726 = 23 x 31 + 3
Operations hierarchy : Operations hierarchy 1st. First, solve the parenthesis
2nd. After that, solve the multiplication and division operations.
3rd. Finally, solve the addition and the subtraction operations.
Slide 20 : Example:
32 – 3 * ( 7 + 6 : 3) =
32 - 3 * ( 7 + 2) =
32 – 3 * 9 =
32 – 27 =
5
3.- On the internet : 3.- On the internet http://bilingualproject.wikispaces.com/Resources
http://www.youtube.com/watch?v=kZKOPKIHsrc&feature=related
http://www.mathgoodies.com/lessons