Multiply and Divide on the Calculator

Multiply and Divide on the Calculator


Multiplying and dividing numbers on your calculator
is very straight forward. Just want to make a quick video just explaining what buttoms
to push, and what to be careful of when you are multiplying or dividing numbers on calculator.
So I’m assuming you have a graphing calculator. Even if you don’t have a graphing calculator
this should still work. Basically you just type the two numbers you want to multiply.
Like if you want to do seven times three you would push seven, and then there should be
a times key, normally the small x indicating times. And then you’d push three and enter
or equals and you’ll get the answer. It’s very, very simple. Really the only thing that
I would recommend that you look at for and to be careful for, is multiplying or dividing
by a negative quanity. And um, there’s a minus key and there’s a negative key, and you have
to make sure to type the correct one.For instance if you wanted to do negative ten divided by
two, but you typed minus ten divided by two, it would give you an error if yoy tried to
compute this uhm, so you can see on your screen here it gives you a syntax error. So all you
would need to do instead is to do negative ten divided by two and get your answer. Uhm,
one nice thing that calculators are very helpful for of course is doing products or quotients
that are much larger than we’re able to do in our head, or that would take a long time
to do on pencil and paper. If you had a hundred and thirty-one times seventy-nine. Type it
in, push enter, and we quickly see it’s ten-thousand-three-hundred-forty-nine. So ah, calculators can be a great help. I
would however say, be careful that you don’t become too dependent on a calculator even
though it can do great things. Ah, if you can do it in your head that’s obviuosly much
faster. So I usually tell my students if you have anything under twelve times twelve, you
should be able to do that in your head, and not have to get out your calculator, and turn
it on, and type all this and that. Uhm, if it’s anything under twelve times twelve, you
should just automatically be able able to say it. But ah, for speed, and for big numbers
a calculator is an awesome way to go.

4 thoughts to “Multiply and Divide on the Calculator”

  1. I have a question about calculator division which not even my maths teacher can answer. When I enter "1 divided by 6" (using the standard division sign of course) I get the result 0.166666666

    But for "7 divided by 6" I get 1.166666667. Why does it round up for one but not the other? Try it on yours, this doesn't seem restricted to any one make or model, and also applies to other decimal results where the final digit is subject to rounding.

    My suggested answer is that it's a deliberate design feature. 1 divided by 6 is treated not as a calculation task so much as a request to express a number in a different form, that is to express a fraction 1/6 as a decimal (a recurring decimal in this case) as a first step in a calculation procedure that will involve other numbers.

    But when the numerator is bigger than the denominator, then the calculator is designed or programmed to treat the entry as if we have two numbers: linked by an operation sign, 1 + 1/6, a calculation task to which a final answer is being sought.

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