# mathematical expressions

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```EXPRESIONES MATEMATICAS
Mathematical expressions
Mathematics is essential for science. Biologists, chemists, engineers, agronomists,
physiologists, sociologists and so forth need math to explain, prove and validate their
findings.
Maths is not only the science of numbers but is also a philosophy, language and a
discipline a way to describe the physical world thus also an attempt to understand it.
Without this tool it would not be possible to do science.
So it is essential that any science student who studies English as well learns some of
the basic terms and expressions used in English when speaking about maths.
Some examples
+
plus
-
minus
6 + 9 = 15
Six plus nine equals / is fifteen.
X
times, multiplied by
5 x 6 = 30
Five times six equals thirty or
:
divided by
=
equals
%
per cent
2
3
3
5
10
6
2
x
three squared
five cubed
six to the power of ten (UK)
six to the tenth power (US)
the square root of x
(
Open bracket
)
Close bracket
Five multiplied by six is thirty.
75%
Seventy-five per cent of the …
5(2+3)=25
Five open bracket two plus
three close bracket is twentyfive or
Five times parentheses around
two plus three is twenty-five
There are other ways to speak about operations.
Addition: 6 + 7 = 13
Subtraction: 9 – 3 = 6
‘six plus seven equals thirteen’
‘nine minus three is equal to six’
‘the sum of six and seven is thirteen’
‘six added to seven is equal to thirteen’
‘six and seven is thirteen’,
‘nine take away three is six’;
‘three subtracted to nine equals six’;
Multiplication: 9 x 3 = 27
Division: 9 &divide; 3 = 3
‘nine times three is twenty-seven’;
‘nine multiplied (by) three is equal to
twenty-seven’.
‘three into nine stays three times;
‘three stays into nine three times’
‘nine divided (by) three is equal to
three’.
There are several main types of brackets:
•
•
•
round brackets, open brackets, brackets (UK), or parentheses: ( )
square brackets, closed brackets, or brackets (US): [ ]
curly brackets, squiggly brackets, definite brackets, swirly
brackets, birdie brackets, Scottish brackets, squirrelly brackets,
braces, or gullwings: { }
Para tener en cuenta:
•
Hay dos maneras de expresar las fracciones en ingl&eacute;s: lo normal es
decir one eighth of the cake, two thirds of the population, etc.
•
En cambio, en problemas o ejercicios matem&aacute;ticos, las fracciones
suelen expresarse en forma diferente. Ejemplo: Multiply two over five
by three over eight (2/5 x 3/8).
•
Para marcar los DECIMALES, en ingl&eacute;s se usa un punto (y NO una
coma). Con respecto a la lectura de los decimales, 4.32 se lee four
point three two, no &quot;four comma thirty two&quot;.
Fractions
1/2
a half or one over two
9/2
nine halves or nine over two
1/3
a third or one third or one over three
1/4
a quarter or one over four
2/5
two-fifths or two over five
1/8
an eighth or one-eighth or one over eight
3/8
three-eighths or three over eight
1/10
a tenth or one-tenth or one over ten
1/16
a sixteenth or one-sixteenth or one over sixteen
Decimals
0.1
UK: (nought) point one.
US: (zero) point one.
0.25
UK: (nought) point two five
US: (zero) point two five
1.75
UK &amp; US: one point seven five
ACTIVITIES:
Solve these activities and write in English how the operations of