DAY 156:

Today’s Challenge

Can you make all four lines work out arithmetically by replacing the 16 ◯’s with the digits 0-9 in our latest MATHELONA challenge?  Each digit can only be inserted a maximum of twice:

◯  +  ◯   =    10    =   ◯  +  ◯
◯  +  ◯   =     1     =   ◯  –  ◯
◯  +  ◯   =    15    =   ◯  ×  ◯
◯  +  ◯   =     5     =   ◯  ÷  ◯

The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from up to 84.

The 1st & 5th rows contain the following fourteen numbers:

2    6    7    9    14    15    16    21    22    40    50    72    81    84

Which four different numbers have a sum of 100?

Answers can be found here.

Click this link for details of online math tuition with me, Paul Godding.

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