1. THE NATURAL NUMBERS N 0, 1, 2, 3, 4...

2. 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

3. What quantity is written on the stone?

4. . Are you sure that you are right? Yes, you are. The quantity is 1,435

5. Try the next challenge

6. What is the number on the wall ?

7. . Are you sure that you are right? Yes, you are. The quantity is 3,244

8. REMEMBER 0 zero 1 2 3 4 5 one two three four five 6 7 8 9 10 six seven eight nine ten

9. 30Thirty 40Forty 50Fifty 60Sixty 70Seventy 80Eighty 90Ninety 100A Hundred 1 000A Thousand 1 000 000A Million 1 000 000 000A Billion

10. THE NATURAL NUMBER SET The Natural Number Set is represented with the letter N N = { 0, 1,2,3,... } This set is represented by the digits from 0, 1, 2, 3... through to infinity. Natural Numbers are used for counting the elements of a set and describing the position of an element in a set.

11. Natural Numbers Representation Natural Numbers are represented in a number line.

12. 2314 +25 2339 Remember when writing: * Unities under unities * Ten unities under ten unities * Hundred under hundred HTUU TH U TH U

13. 934 -25 909 Remember when writing: * Unities under unities * Ten unities under ten unities * Hundred under hundred HTUU -H U H U 2. Subtraction :

14. 354 x 26 2124 708 9204 Remember when writing: * Unities under unities * Ten unities under ten unities * Hundred under hundred 3. Multiplication :

15. 72623 2631 3 4. Division : Remember: Dividend = 726 Divisor = 23 Quotient = 31 Remainder = 3 Dividend = Divisor x Quotient + Remainder 726 = 23 x 31 + 3

16. Comparisons »7 > 5 Seven is greater than five »5 < 7 Five is less than seven »3 = 3 Three is equal to three

17. Learn more at: »http://www.mathsisfun.com/numbers/ev olution-of-numbers.htmlhttp://www.mathsisfun.com/numbers/ev olution-of-numbers.html