Recent comments in /f/explainlikeimfive

Spadeninja t1_iyc313a wrote

The thing that is confusing to me though is that math is precise - especially when considering massive undertakings like space flight for example

There are laws of physics and math… so if the reasons why the order of multiplication vs addition (despite leading to potentially VASTLY different conclusions) are somewhat arbitrary… why does it still work?

The example in the original post lead to two different answers, and that was an extremely basic example.

How does this work with hundreds of different calculations?

0

Way2Foxy t1_iyc2s6k wrote

I wasn't trying to be clever, I was just choosing random numbers.

You're right, though, and you definitely can use long multiplication to multiply any two rationals using only addition (though not sure if/how you can reduce to the lowest terms).

I got lost/distracted and started arguing something I didn't mean to initially. My initial argument that I still hold is that you can't define multiplication as simply repeated addition, and to further clarify I mean strictly that if you multiply a and b you add a to itself b-1 times.

0

thatguysaidearlier t1_iyc2bxp wrote

In the UK the kitchen tap/faucet is attached directly to the incoming water main pipe.

The bathroom sinks, particularly in older houses, was sent through a header tank, so that the cold tap had a similar pressure and/or flow rate to the hot tap/faucet which was also regulated by a header tank.

Sometimes if not properly covered, those tanks were home to dead pigeons or squirrels, so you never drank from anywhere but the kitchen tap.

Might that explain the taste at your house?

Seeing if the water comes out at the same rate as the kitchen tap would be a good first test to see how it might be plumbed.

1

Primordial_Cumquat t1_iyc27x6 wrote

A single gunshot wound can cause significant damage. The prospect of bleeding out or a lung collapsing is very real unless help can be reached quickly. Once the next line of help is reached, repair can be complex and complications can arise.

But yeah, your question makes little sense, if you could refine or reword it.

3

Sereaph t1_iyc1wc1 wrote

you're trying to be clever using those decimals, but the concept is still the same.

First let's convert those decimals into symbology that's easier to work with (fractions):

0.75 = 3/4

0.44 = 11/25

0.75 x 0.44 = 3/4 x 11/25

So therefore using ADDITION to evaluate the multiplication of the fractions,

11+11+11 = 33 for the numerator

25+25+25+25 = 100 for the denominator

The fraction 33/100 simplifies to 0.33 in decimal form.

3

Phage0070 t1_iyc1rtj wrote

Your submission has been removed for the following reason(s):

Rule #1 of ELI5 is to be nice.

Breaking rule 1 is not tolerated.

If you would like this removal reviewed, please read the detailed rules first. **If you believe it was removed erroneously, explain why using this form and we will review your submission.

1

Way2Foxy t1_iyc1lfu wrote

I don't think we disagree that doing multiplication prior to addition makes sense intuitively.

My point is that there's nothing forcing us to do it that way, and we could have a well defined system where we add and subtract first. If you disagree with that, then fair enough.

1

Phage0070 t1_iyc1kek wrote

Your submission has been removed for the following reason(s):

ELI5 is not for information about a specific narrow issue (personal problems, private experiences, legal questions, medical inquiries, how-to, relationship advice, etc.)

ELI5 is not for information about current events.

If you would like this removal reviewed, please read the detailed rules first. If you believe this was removed erroneously, please use this form and we will review your submission.

1