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How do you do mental math?

Nachum Pereferkovich asked 11 months ago

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867 views 5 comments

I got the feeling that some kind of connection exists. All the mathematical calculations in my head I do only with the help of words. Under such conditions, to correctly copy the 10-digit phone number manually from the monitor onto paper, it takes me at least 19 seconds. Clearly, math is not my forte. But could it become my forte… what other ways are there to do “mental math” without visualization?

How do you do mental math? Share your experiences in the comments below.

Reg Forsaith November 21, 2019 01:16 pm

When I was younger, it was pretty easy and I don’t know how I did it.

Not "savant level cube root of poly digit stuff, but simple arythmetic was no big deal.

Now I’m older, I often resort to breaking things into tens, hundreds etc, or nearby multiples

Ferinstance:

8, 2,3,7,6,4 added up get broken into the three pairs that make up tens,and there’s three of ’em, so thirty.

25% discount off of $47 is well nearly $48, so a bit less than $12. If I then need to get picky, well its $1 less and that’s $0.25 so$11.75 discount

That sort of thing.

These days, I’m more likely to just reach for the phone and select the calculator app.

Its never seemed to be a visual thing, just a practice thing.

Like I can still recognise integral calculus, and I understand the principle of it relating to an area under a curve, but couldn’t solve one to save my life.

Iblis Bane replied 10 months ago

Yeah, that’s pretty much how I do it. Break it into easy round-number sums, (often multiple ones) and then do the last minute adding or subtracting for the differences.

dusti foster January 27, 2020 04:13 am

I can do mental math, but if I use my fingers it is easier and faster. I took a lot of flak for that at school, though I never understood why.

Dianna Moylan February 21, 2020 06:53 pm

I was really good at mental maths as a child and continue to be so. How would pictures improve this, i wonder. I think they’d just get in the way.

Dianna Moylan February 21, 2020 06:53 pm

I was really good at mental maths as a child and continue to be so. How would pictures improve this, i wonder. I think they’d just get in the way.

Dianna Moylan February 21, 2020 06:53 pm

I was really good at mental maths as a child and continue to be so. How would pictures improve this, i wonder. I think they’d just get in the way.

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