Mix Numbers Help

[jinroh10]

Hello all, im doing some mixed number and need my tech family to please help. Please tell me how did this example get 1x5? Please help!!

[Trik'Stari]

....

 

the hell kinda crazy math is that?

[jinroh10]

Lol...Admission testing for respiratory.

[Technous285]

    1 x 5

1   - - -

    4 x 5

 

That's basically always going to be 1.25 when written in decimals, as 1/4 * 5 (they multiply the top number and bottom number separately, which is why it's basically written as 1x5 over 4x5) = 5/20 = 0.25.

The bottom line is basically saying 1.25 + 2.80 = 3 + 1.05 = 4.05, at least to me

At least that's what my Year 8 maths from back in 2001 is trying to tell me.

[juretrn]

1 1/4 = 1 5/20 , multiuplying by 5/5 is the same as multiplying by 1.

but seriously, just multiply the numerators and then multiply the denominators.

[jinroh10]

Ooook....let me try that.

[juretrn]

Oh wait this is all the same thing?

 

First thing you do is add the "big numbers" -> 1+2 =3

Then get the fractions on a common denominator. 

1/4 and 8/10, common denominator is 1/20. That means you have to multiply 1/4 with 5/5 and 8/10 with 2/2. Then simply add these resulting fractions

[Technous285]

Oh wait this is all the same thing?

 

First thing you do is add the "big numbers" -> 1+2 =3

Then get the fractions on a common denominator. 

1/4 and 8/10, common denominator is 1/20. That means you have to multiply 1/4 with 5/5 and 8/10 with 2/2. Then simply add these resulting fractions

I believe so, the telling fact is the last line of numbers reads (when converted to decimal) as (1 + 0.25) + (2 + 0.80) = (3 + 1.05) = 4.05, at least to me. The preceding lines show how to get the faction-based values of the final line.