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can you still do sums without using a calculator?

meths [Edit] [Delete] 25 replies 11:24, 7 August '09

i mean written down sums, not mental arithmatic.

i just tried to do a simple "take away" sum and failed miserably. in my head, easy peasy, but written down - uh uh. i can still add up and do do mulitplication, long division however...

can you remind me how to do it? diagrams would help. i.e. we couldnt work out how to do this:

221
-56
_____
= ???

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  • no

    Lucien | 7 Aug '09, 11:25 | X
  • What the hell are you talking about

    thewarn | 7 Aug '09, 11:25 | X
    • you know maths yeah?

      the basis of the universe

      meths @thewarn | 7 Aug '09, 11:27 | X
  • I'd just do it in my head.

    Playing darts helps with this.

    But yeah, I couldn't do it on paper 'showing my working'. I'd probably fail GCSE maths, even though I'd get the answer right.

    bamos | 7 Aug '09, 11:26 | X
    • Heroes like Bamos. They deserve high definition.

      Lucien @bamos | 7 Aug '09, 11:28 | X
  • 165

    without a calculator

    brusma | 7 Aug '09, 11:28 | X
    • der.

      how do you work it out tho?

      meths @brusma | 7 Aug '09, 11:29 | X
      • 221 - 56

        = 221 - 6 - 50
        = 215 - 50
        = 200 - 50 + 15
        = 150 + 15
        = 165

        or something along those lines

        JustJay @meths | 7 Aug '09, 11:33 | X
        • i wish i went to your school...

          meths @JustJay | 7 Aug '09, 11:35 | X
  • Probably not

    I reckon I could still suss a simultaneous equation, but I wouldn't be able to show my working so I might as well just cheat.

    Royter-Hatfood | 7 Aug '09, 11:30 | X
  • Actually, yeah

    221
    -56

    You can't take 6 from 1, so cross out the 2 in the middle and put the 1 next to the other 1 to make 11. Now take 6 from 11 = 5.

    WRITE DOWN 5 UNDERNEATH THE 6

    Now you're left with 21 on top (now you've crossed out the 2 and replaced it with a 1). So take away 5 from 21. This gives you 16.

    WRITE DOWN 16 IN FRONT OF 5.

    This give you 165.

    thewarn | 7 Aug '09, 11:30 | X
    colinzealuk this'd this
    • nice workings.

      i'm not sure thats how i rememeber it tho. i'm gonna check with my mum. she can do the times tables using only her fingers.

      meths @thewarn | 7 Aug '09, 11:33 | X
  • http://img194.imageshack.us/img194/8622/methsisa.jpg

    cowcow | 7 Aug '09, 11:31 | X
  • Nope

    Sin, cos and tan are now nothing more to me than words I can try in vain to make funnier words out of

    DanielKelly | 7 Aug '09, 11:32 | X
  • ...

    Absolutely. I use Google now.

    Stealthy | 7 Aug '09, 11:32 | X
  • I couldn't ever do long division :(

    can someone teach me?
    I'm amazing at times tables though

    harru | 7 Aug '09, 11:37 | X
    • what is "long" division?

      JustJay @harru | 7 Aug '09, 11:37 | X
      • heres a helpful video to explain

        http://www.youtube.com/watch?v=XKUxxPu-hx0

        inside-outside @JustJay | 7 Aug '09, 11:41 | X
      • i don't know.

        you're not helping!

        harru @JustJay | 7 Aug '09, 11:42 | X
  • i got a takeaway last night and the guy used a calculator to work out £4.95 + 50p

    I wasn't shocked to learn it was £5.45
    THEN straight after he used it to work out £5.85 + 50p.
    To be continued...

    inside-outside | 7 Aug '09, 11:40 | X
  • yes i can.

    i do sums all the day. just there i had to do this:
    hL = 22.96 x ( (87.087 x 66.672) / 43.764 )

    justanothersheeldz | 7 Aug '09, 11:41 | X
  • 165

    what do i win?

    colon_closed_bracket | 7 Aug '09, 11:43 | X
    • A calculator

      thewarn @colon_closed_bracket | 7 Aug '09, 11:44 | X
      • i would show my working

        but tinypic is blocked at work! (I'm amazed that DiS is allowed; i think my IT manager just pities me).

        colon_closed_bracket @thewarn | 7 Aug '09, 11:46 | X
        • just type it out on here.

          its not that hard.

          meths @colon_closed_bracket | 7 Aug '09, 11:48 | X
  • I did it

    but I do it all in my head so no working to show sorry

    fullerov | 7 Aug '09, 12:46 | X
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