Given the following diagram, what are the missing two numbers in the last figure?

This is from a mathematics book for primary school

enter image description here

  • $\begingroup$ Has a correct answer been given? If so, please don't forget to $\color{green}{\checkmark \small\text{Accept}}$ it :) $\endgroup$
    – Rubio
    Jan 27 at 15:59

1 Answer 1


In each given circle, the middle number equals

(A - B) * (C / D)


all four outer numbers A B C D are from 1 to 9 inclusive, and A and B are adjacent.

The last circle fits this pattern if

the right number is 9 and the bottom number is 1.

  • 1
    $\begingroup$ Why not 1 and 1? Wouldn't this also work? $\endgroup$
    – hexomino
    Jan 25 at 16:54
  • $\begingroup$ @hexomino rot13(Lrf, jul abg? Jryy, lbh pbhyq nqq gur nqqvgvbany erfgevpgvba gung N unf gb or ynetre bg rdhny gb P.) $\endgroup$
    – theozh
    Jan 25 at 18:53

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