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1 + 4 x 2 = ? .. 10 or 9 ?

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  • 1 + 4 x 2 = ? .. 10 or 9 ?

    1 + 4 x 2 = ? .. 10 or 9 ?

    and why.

  • #2
    Brackets, can be a bit like commas. (Let's eat, Mummy.)

    Comment


    • #3
      Originally posted by artemis View Post
      Brackets, can be a bit like commas. (Let's eat, Mummy.)
      Yup.

      BODMAS. Although, surprisingly, there was a time when different groups of people used a different set of rules.

      Ok

      You have a square with a perimeter of 8 meters.

      What is the area of that square?

      Comment


      • #4
        Originally posted by McDuck View Post

        You have a square with a perimeter of 8 meters.

        What is the area of that square?
        For this one, you just need to visualize a square with each side being 2 meters in length.
        And realize that

        area = length by width (only).

        So, three separate mental operations and remembering a very old formula. Pat yourself on the back if you got that one.
        Last edited by McDuck; 25-03-2021, 07:47 AM.

        Comment


        • #5
          Next.

          1.9 + 0.1

          Is closer to 20.0 ?

          or 2.0 ?

          or 0.2 ?

          No calculators.

          Comment


          • #6
            Why the primary school maths test??

            Comment


            • #7
              Originally posted by hawkeye View Post
              Why the primary school maths test??
              Ha.

              Giving the older people a chance to dust off the cobwebs..
              Giving younger people a chance to show their stuff.

              They may get a little harder.

              Comment


              • #8
                Originally posted by McDuck View Post
                Next.

                1.9 + 0.1

                Is closer to 20.0 or 2.0 or 0.2 ?
                .
                Ok, this one just requires you to notice that 1.9 is almost 2.
                So you might think of it as $1.90 as almost $2.

                You must also be familiar with decimal convention. Possibly people bought up with old money might be a bit thrown.

                Comment


                • #9


                  So, for that one, you need to have paid attention to gears or circles at some time in your life.
                  The main thing to notice is that all the gears don't turn the same way.
                  Every second gear goes in the opposite direction.

                  Get two round coasters or even two apples and try it.
                  Last edited by McDuck; 27-03-2021, 12:18 PM.

                  Comment


                  • #10


                    Q: This is a paper cube, all flattened out.
                    If you fold it up into a box, what will the folded box look like?
                    A, B, C, D?

                    * Yes, there is a slight mistake, I didn't do the drawing, just pick the one that is almost correct.
                    Last edited by McDuck; 27-03-2021, 12:28 PM.

                    Comment


                    • #11
                      Originally posted by McDuck View Post
                      OK, this one is very tricky.
                      It uses the natural human ability of imagination and visualization to solve.
                      But don't get cocky, crows and octopi can do it very well too, some say better.

                      Each one of the possible solutions are incorrect,
                      but one of the solutions has only one mistake.

                      You just need to break it down into two overlaying problems.
                      The problem of adjacent coloured faces.
                      and the problem of coloured dots on those faces.

                      One of the answers require that you perform one correction. The other answers require you perform more.

                      It's super tough, and requires previous experience with revolving objects.
                      So don't be too hard on yourself it you don't get it.

                      Sunday, day off
                      Next one Monday.

                      Last edited by McDuck; 28-03-2021, 09:00 AM.

                      Comment


                      • #12




                        This one is going to show up some holes in the way people reason.


                        The guard dog barked each time there was an intruder.

                        The guard dog is barking.

                        Is there an intruder?
                        Last edited by McDuck; 29-03-2021, 07:35 AM.

                        Comment


                        • #13
                          Originally posted by McDuck View Post


                          Q: This is a paper cube, all flattened out.
                          If you fold it up into a box, what will the folded box look like?
                          A, B, C, D?

                          * Yes, there is a slight mistake, I didn't do the drawing, just pick the one that is almost correct.

                          C'mon McDuck get your act together. Get out your scissors and colour pencils and do a bit of research on this one. The only confusing part about this puzzle is that you say there is a "slight mistake" in it.

                          There is no mistake in this and there is one very clear answer to it.

                          Get back to me when you've worked it out.

                          If you can't do it... ask an 8 year old to help you.

                          Comment


                          • #14
                            Originally posted by Aston View Post


                            C'mon McDuck get your act together. Get out your scissors and colour pencils and do a bit of research on this one. The only confusing part about this puzzle is that you say there is a "slight mistake" in it.

                            There is no mistake in this and there is one very clear answer to it.

                            Get back to me when you've worked it out.

                            If you can't do it... ask an 8 year old to help you.
                            Ha!

                            You may be right.

                            I'm naturally pretty good at rotating objects in my mind, but yup, everyone has limitations.
                            What one do you think is closest or exactly spot on?
                            And I'll double check it.

                            Comment


                            • #15
                              Originally posted by McDuck View Post

                              Ha!

                              You may be right.

                              I'm naturally pretty good at rotating objects in my mind, but yup, everyone has limitations.
                              What one do you think is closest or exactly spot on?
                              And I'll double check it.
                              Work it out yourself, you posted it. Forget the "closest" thing, there is a correct answer.

                              Comment

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