# DAY/DYDD 264: The Main Challenge

Your task is to make the four lines below work out arithmetically.

Simply place the digits 0 to 9 into the 16 gaps, but each digit must only be inserted a maximum of twice in the whole challenge.

◯  +  ◯   =    12    =   ◯  +  ◯
◯  +  ◯   =     1     =   ◯  –  ◯
◯  +  ◯   =     5     =   ◯  ×  ◯
◯  +  ◯   =     2     =   ◯  ÷  ◯

Click Mathelona for further details of our popular pocket book challenges. 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

What is the sum of the multiples of 8? The Factors Challenge

Which FOUR of the following numbers are NOT factors of 264?

2    3    4    5    6    7    8    9    10    11    12 The Mathematically Possible Challenge

Using 37 and once each, with + – × ÷ available, which are the FOUR numbers it is possible to make from the list below?

5    10    15    20    25    30    35    40    45    50

#5TimesTable The Target Challenge

Can you arrive at 264 by inserting 2, 4, 6, 7 and 9 into the gaps below?

•  (◯+◯)×(◯+◯)×√◯ = 264   