Transcript saying numbers & mathematical formulas

SAYING NUMBERS &
MATHEMATICAL
FORMULAS
NUMBERS
Group 1
 written
 1,011
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said
one thousand eleven
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21,011
twenty-one thousand eleven
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721,011
seven hundred twenty-one
thousand eleven
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Group 2
written
1,256,721
said
one million two hundred fiftysix thousand
seven hundred
twenty-one
31,256,721 thirty-one million two hundred fifty-six
thousand seven
hundred twenty-one
631,256,721
six hundred thirty-one
million two
hundred fifty-six thousand seven
hundred twenty-one
HUNDRED, THOUSAND, MILLION,
BILLION, TRILLION
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Group 3
written
1,492,638,526
said
one billion four hundred
ninety-two million six hundred
thirty-eight thousand five hundred
twenty-six
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41,492,638,526
forty-one billion four hundred
ninety-two
million six hundred
thirty-eight thousand five hundred
twenty-six
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941,492,638,526
nine hundred forty-one billion four
hundred
ninety-two million six hundred
thirty-eight thousand five hundred twenty-six
DECIMALS
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2.36=>two point three six
PERCENTAGES
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37%=>thirty seven percent
FRACTIONS
NUMERATOR-DENOMINATOR
Read the top number as a cardinal number,
followed by the ordinal number + ‘s’
 3/8=>three eighths
 NOTE:
 ¼ =>one quarter, 2/3 => two thirds, ½ one half
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EXPRESSIONS
HERE ARE THE DESCRIPTIVE NAMES OF A
NUMBER OF IMPORTANT NUMERICAL
EXPRESSIONS:
speed 100 mph (miles per hour) weight 80
kg (kilograms) OR 42 lbs
(pounds) telephone number 0171 895
7056 decimal .087 date 12/04/65 percentage
75% temperature 28° C (celsius) or 7° F
(fahrenheit) height 1 m 89 cm price
$60 fraction 8/13 score 2-1
“0”
HAS SEVERAL OTHER NAMES, DEPENDING
ON CONTEXT
zero: formal scientific usage
 naught / nought: mostly British often in
decimals
 oh: used when spelling numbers (like telephone,
bank account, bus
 nil: in general sport scores, British usage ("The
score is two–nil.")
 nothing: in general sport scores, American usage
("The score is two–nothing.")
 null: used technically to refer to an object or idea
related to nothingness.
 love: in tennis, badminton, squash and similar
sports
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x+1 x plus one
x-1 x minus one
x±1 x plus or minus one
xy xy / x multiplied by y
x:y divided by
(x-y)(x+y) x minus y, x plus y
= the equals sign
x=5 x equals 5 / x is equal to 5
x≠5 x (is) not equal to 5
x≡y x is equivalent to (or identical with) y
x>y x is greater than y
x≥y x is greater than or equal to y
x<y x is less than y
x≤y x is less than or equal to y
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0<x<1 zero is less than x is less than 1
0≤x≤1 zero is less than or equal to x is less than or
equal to 1
x2 x squared / x (raised) to the power 2
x3 x cubed
x4 x to the fourth / x to the power 4
xn x to the nth / x to the power n
x (−n) x to the (power) minus n
x^2 (square) root x / the square root of x
x^3 cube root (of) x
x^4 fourth root (of) x
x^n nth root (of) x
(x+y)2 x plus y all squared