yeah, "much of the same thing" in the sense that the "media" is artificially inflating the voice of the global warming "skeptics".
English
yeah, "much of the same thing" in the sense that the "media" is artificially inflating the voice of the global warming "skeptics".
Last Update: 2018-02-13
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Spanish
and if it is a percentage of decrease, we will subtract: 80 - 20 = 60, so we will
obtain that 80 decreased by 25% is 60.
knowing this, we should point out that there is a shortcut to do these
operations, which may help us (a lot!) to speed up our calculations.
we can use the reference to the unit (1) instead of the traditional 100%, so,
to increase a number by 25%, we add:
1 + 0.25 = 1.25 (mentally, so we save time)
and then we apply it to our initial amount:
80 * 1.25 = 100
getting the same result above mentioned but in only one arithmetical
operation (one multiplication).
in the same way, to decrease a number by 25%, we subtract:
1 - 0.25 = 0.75 (mentally again)
and again we apply it to our initial amount:
80 * 0.75 = 60
using this method, you will save valuable time, reducing the operations that
you have to perform and, sometimes, your need of the calculator.
i recommend starting with 'easy' percentages and round numbers, both
multiplying and dividing (you can use the calculator when you need it), to
see for yourself their effect on the figures. for example:
to increase and decrease 200 by 25%
200 * 1.25 = 250
200 * 0.75 = 150
10
English
to increase and decrease 500 by 40%
500 * 1.40 = 700
500 * 0.60 = 300
to increase and decrease 300 by 30%
300 * 1.30 = 390
300 * 0.70 = 210
so, as you can see, when multiplying by more than the unit (1), we increase
the initial number, and, on the contrary, when multiplying by less than the
unit, we decrease the initial number.
as you get used to practise this shortcut, you will feel more comfortable to
do it with different and longer decimals.
for example, to increase by 1%, we can multiply by 1.01 (i.e., 1 + 0.01); and
to increase by 0.5%, we can multiply by 1.005 (i.e., 1 + 0.005).
with the same idea, to decrease by 1%, we can multiply by 0.99 (because it
is 1 - 0.01); and to decrease by 0.5%, we can multiply by 0.995 (because it is
1 - 0.005).
here we present some examples:
increasing 200 by 1%
200 * 1.01 = 202
Last Update: 2021-03-09
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