30 December 2013: MAKE 30

Use some mental arithmetic (or pen & paper) to solve three different-length versions of my regular MAKE puzzle.

Insert + – x or ÷ when you see ? so the results of the 3- 5- and 7-number calculations are each 30 when working one step at a time from Left to Right (and no brackets allowed):

  •   15  ?  10  ?  20  =  30
  •   1  ?  2  ?  3  ?  4  ?  5  =  30
  •   7  ?  6  ?  5  ?  4  ?  3  ?  2  ?  1  =  30

Let us know your answers by commenting below.

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2 Responses to 30 December 2013: MAKE 30

  1. awizzbang says:

    15/10×20=30

    1-2+3+4×5=30

    7+6-5×4-3+2-1=30

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