The four operations
Addition |
4 + 5 = 9 |
We add four to five and get nine. Four and five equals nine Four and five is (are) nine. |
Subtraction |
9 – 4 = 5 |
We subtract four from nine and get five. Four from nine is five. |
Multiplication |
4 x 5 = 20 |
We multiply four by five and get twenty. Four times five is twenty. |
Division |
20 : 4 = 5 |
We divide twenty by four and get five. |
Fractional numerals Common Fractions
1/3 – a (one) third 2/3 ton – two thirds of a ton
1/8 – an (one) eighth ¾ kilometre – three quarters of a kilometre
½ – a (one) half ½ ton – half of a ton
¼ – a (one) quarter 2 ½ tons – two and a half tons or two tons and a half
2/3 – two thirds 4 1/3 tons – four and a third tons or four tons and a third
3/5 – three fifths 1 ½ hours – one and a half hours or one hour and a half
5/6 – five sixths 1 1/3 pounds – one and a third pounds or one pound and a third
Decimal Fractions
0.1 |
nought [no:t] point one |
1.25 tons |
one point two five tons |
0.01 |
nought point nought one |
23.76 tons |
two three point seven six tons or twenty-three point seven six tons |
0.25 |
nought point two five |
14.105 |
one four (or fourteen) point one nought five |
Extra information
0 |
|
0; zero |
1/2 |
|
a half; one half |
1/3 |
|
a third; one third |
3/4 |
|
three fourths |
1/2bh |
|
a half of the product bh |
|
|
u is equal to the ratio of divided by one plus x square |
0.02 |
|
0 point 0 two |
38.75 |
|
thirty-eight point seventy five |
+ |
|
plus |
- |
|
minus |
x |
|
multiplication sign |
: |
|
sign of division |
= |
|
sign of equality |
() |
|
round brackets |
[ ] |
|
square brackets |
a=b |
|
a is equal to b; a equals b; |
a»b |
|
a approximately equals b |
a>b |
|
a is greater than b |
a<b |
|
a is less than b |
x=-x |
|
x approaches infinity |
a·b=c |
|
a multiplied by b equals c |
a/b=c |
|
a divided by b equals c a divided by b is c the ratio of a to b is c c is equal to a divided by b |
a+b=c |
|
a plus b is c, a plus b are equal to c a plus b is equal to c |
a-b=c |
|
a minus b is equal to c |
x2 |
|
x squire, x squired; x to the second power; x raised to the second power; the square of x; the second power of x |
y3 |
|
y cube; y cubed; y to the third power |
z-12 |
|
z to the minus twelfth power |
∞ |
|
infinity |
C |
|
constant |
|
|
the square root of a is (equals) b |
|
|
the fifth root of a square |
a′ |
|
a prime |
a″ |
|
a second prime a double prime a twice dashed |
a1 |
|
a sub one a first |
am |
|
a sub m |
f′c |
|
f prime, sub c f sub c, prime |
|
|
second derivative of x |
|
|
first derivative of x with respect to y |
ym=f(x) |
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y is function of x y sub m is a function y x |
|
|
integral of.... from m to n integral of .... between limits n and m |
|
|
v is equal to u; square root of sine square i plus cosine square i is equal to u |
% |
|
per cent |
0.52 % |
|
point five two per cent zero point five two of one per cent |
450C |
|
forty five degrees Centigrade |
