# DAY 210:

Today’s Challenge

Try the following MATHELONA challenge, similar to my pocket book challenges but slightly tougher!  Full details of our pocket book can be found by clicking MATHELONA.

Your task is to make all four lines work out arithmetically by replacing the 16 ◯’s below with the following digits.  Can you  achieve it?

0    0    1    1    2    2    3    3    4    4    5    6    6    7    8    9

◯  +  ◯   =    8    =   ◯  +  ◯
◯  +  ◯   =    7    =   ◯  –  ◯
◯  +  ◯   =    6    =   ◯  ×  ◯
◯  +  ◯   =    4    =   ◯  ÷  ◯

The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.

The 2nd & 5th rows of the playing board contain the following fourteen numbers:

6    7    8    16    17    21    28    48    50    55    63    64    81    84

How many factors does the lowest number have?

Make 210 Challenge

Can you arrive at 210 by inserting 5, 10, 12 and 18 into the gaps on each line?

•  ◯×◯+◯×◯ = 210
•  (◯–◯÷◯)×◯ = 210