NATURAL NUMBERS
All the numbers which are used for counting and starts from one are called NATURAL NUMBERS such as : 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 …………..
WHOLE NUMBERS
All natural numbers along with zero (0) are called WHOLE NUMBERS, Such as : 0 1 2 3 4 5 6 7 8 …………….
ODD NUMBERS
ODD NUMBERS are those numbers which are not divisible by 2 , such as : 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37…………
EVEN NUMBERS
EVEN NUMBERS are those numbers which are divisible by 2, such as 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40……
PRIME NUMBERS
PRIME NUMBERS are those numbers which are divisible by one and by itself only, Such as 2 3 6 7 11 13 17 19 23 29 31 37 41 47 53 59 61 67 71 73 79 83 89 97…….
COMPOSITE NUMBERS
COMPOSITE NUMBERS are those numbers which are divisible by itself and by at least one Prime Number such as:
4 6 8 9 10 12 14 15 16 18 20 22 24 25 26 27 28 30 32 33 34 35 36 38 39 40 42 44 45 46 48 49 50 ……….
FRACTIONAL NUMBERS
Fractional Numbers: (Fractions)Any number which is a part of a whole number is called a fractional number or Fraction, such as,
1/2 , 1/4 , 1/5 , 1/6
e.g.. 1/2 (Half) is a part of 1 (Whole)
Fractional Name Fraction
Half…. 1/2
One-third 1/3
One-fourth 1/4
Two-third and so on 2/3
DECIMAL NUMBER
Fractional numbers can also be indicated by placing a dot called the decimal point. e.g. the fraction
1/4 can be written as 0.25
1/2 can be written as 0.50
1¼ can be written as 1.25
MEANING OF METRIC PREFIXES
| Thousand
1000 |
Hundred
100 |
Ten
10 |
Basic Unit
1 |
Tenth
1/10 |
Hundredth
1/100 |
Thousandth
1/1000 |
| Kilo | Hecto | Deca | Metric units Metre,Litre,Gram | Deci | Centi | Milli |
