I worked with a guy who could multiply and divide two 3-digit numbers in his head. He converted them into logs, did an add or subtract, and converted the log back again to a number. He didn't use calculators.
I bought a scientific calculator from The Warehouse. It cost $1.99 including batteries. It is excellent.
sally63,
Jan 17, 9:36am
I need one! Thanks for that
schnauzer11,
Jan 17, 11:31am
Damned right!
barrie2,
Dec 16, 5:59am
7 metres x 2.5 metres. Thanks - I have a mental blank how to work this out.
wembley1,
Dec 16, 6:03am
Seven times point five is 3.5 Seven times two is 14
14 plus 3.5 is 17.5 square metres
barrie2,
Dec 16, 6:26am
🤪 Thanks.
tygertung,
Dec 16, 6:33pm
Square metres is easy, you just multiply the dimensions by each other, so 7 x 2.5 = 17.5. You can use a calculator if it isn't easy to do in your head.
ira78,
Dec 16, 7:17pm
You literally just put the math RIGHT THERE.
wembley1,
Dec 16, 7:54pm
Fixed it for you.
amasser,
Dec 16, 8:07pm
No easier in yards!
shanreagh,
Dec 16, 8:16pm
'maths'
We are not in the US!
tygertung,
Dec 16, 10:15pm
Yes, Math makes no sense as no-one says Mathematic, it is always Mathematics.
bill1451,
Dec 18, 5:09am
were you out smoking in the bike sheds when math was on. dear me sad state of our intelligensia lol. rocket science NOT.
And in bloody case. seven multiplied by two and a half is not mathematics, it is frigging arithmetic!
apollo11,
Dec 18, 8:17am
I think we should call it arithmetics.
gyrogearloose,
Dec 18, 6:46pm
It depends whether it's a parallelogram or square. Are the interior angles 90 degrees?
oh_hunnihunni,
Dec 18, 7:54pm
Oh shut up you lot. Some of us need google to work square meterage stuff out cos we were too busy conjugating Latin verbs to come to grips with all that.
jmma,
Dec 18, 8:09pm
Metreage, just saying lol
shanreagh,
Dec 18, 9:03pm
True 'dat.
Maths, maths etc
bill1451,
Dec 19, 12:56am
Arithmetic is one of a branch of Maths, whether it be Algebra, T r i g o n o m e t r y or geometry, not sure on admaths, Calculus maybe dunno, didnt get to be a rocket scientist or astro physicist, just an old worn out sparky here, Polytech maths gets me where I wanna go woh oh.
wembley1,
Dec 19, 5:48am
Linus Pauling, Nobel Laureate in Chemistry tends to disagree:
"The most obvious difference is that arithmetic is all about numbers and mathematics is all about theory. In college, I have a vivid memory of Linus Pauling delivering a guest lecture and after scrawling theoretical mathematics all over three blackboards, a student raised his hand and pointed out that 7 times 8 had been multiplied wrong in one of the earlier steps. Pauling’s answer was, “Oh, that… numbers are just placeholders for the concept.” And, he just waved away the fact that the numerical conclusion was obviously not accurate."
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