A number is a word (such as ‘five’) or symbol (such as ‘3’) that represents an amount of quantity. We use numbers for counting or calculating.
- Even numbers (= 2, 4, 6, 8, etc.)
- Odd numbers (= 1, 3, 5, 7, etc.)
Whole number
a number (such as 0, 1, 5, 8) without fractions or decimals
Round number
a number that often ends in 0 or 5
Cardinal numbers
Numbers (such as 1, 2, 3) that indicate quantity are called cardinal numbers.
- I have five books.
Ordinal numbers
Numbers (such as first, second, third) that are used to put things in an order are called ordinal numbers.
- This is the fifty-sixth floor.
1st first
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60th sixtieth
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2nd second
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61st sixty-first
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3rd third
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62nd sixty-second
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4th fourth
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63rd sixty-third
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5th fifth
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100th hundredth
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6th sixth
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1000th thousandth
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Nominal numbers
Numbers (such as zip code or a player on a team) used in labeling or identifying something are called nominal numbers.
The number 0
0 is called zero (British English also nouht). The letter o means zero in years, telephone numbers, room numbers, bus numbers and times. (My number is five o double six =My number is 5066). Nil means the number 0 as the score in games (The score was three nil=The score was 3-0.).
Fraction
A division of a whole number is called fraction.
1/2 a half
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4/16 four sixteenths
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1/3 a/one third
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6/32 six thirty-seconds
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1/4 a/one quarter
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11/2 one and a half
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3/4 three quarters
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22/3 two and two thirds
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1/5 a fifth
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Decimal fraction
Decimal fraction or decimal is fraction that is written with a point (.). We say all the digits after a decimal point separately. Money is said like normal numbers.
0.5 point five
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0.35 point three five
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0.05 point zero five
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0.529 point five two nine
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2.5 two point five
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$26.95 twenty-six ninety-five
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