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

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Presentation transcript:

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

REMEMBER 0 zero one two three four five six seven eight nine ten

Eleven Twelve Thirteen Fourteen Fifteen Sixteen Seventeen Eighteen NineteenTwenty Twenty-oneTwenty-two Twenty-three...

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

Operations »5 + 3 Five plus three »8 – 3Eight minus three »6 x 2Six times two »15 / 3Fifteen divided by three

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 »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?

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

As you know, The Romans used this letters: IVXLIVXL One Five Ten Fifty CDMCDM A Hundred Five Hundred A Thousand

What quantities are written? a)MVI b)CXLII

What quantities are written? a)MVI1 006 b)CXLII 142

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 The Natural Number Set is represented with the letter N N = { 0, 1,2,3,... } Operations 1.Addition = ?

Remember when writing: * Unities under unities * Ten unities under ten unities * Hundred under hundred HTUU TH U TH U

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

354 x Remember when writing: * Unities under unities * Ten unities under ten unities * Hundred under hundred 3. Multiplication :

Division : Remember: Dividend = 726 Divisor = 23 Quotient = 31 Remainder = 3 Dividend = Divisor x Quotient + Remainder 726 = 23 x

Operations hierarchy 1 st. First, solve the parenthesis 2 nd. After that, solve the multiplication and division operations. 3 rd. Finally, solve the addition and the subtraction operations.

»Example: 32 – 3 * ( : 3) = * ( 7 + 2) = 32 – 3 * 9 = 32 – 27 = 5

3.- On the internet » » »