DAY 283: The Main Challenge

. . . is Mathelona with a difference, not an addition in sight!

But can you still make all four lines work out arithmetically by filling the 16 gaps with digits from 0 to 9?  Remember, each digit can only be inserted a maximum of TWICE:

◯  –  ◯   =    6    =   ◯  ×  ◯
◯  –  ◯   =    2    =   ◯  ÷  ◯
◯  –  ◯   =    8    =   ◯  ×  ◯
◯  –  ◯   =    1    =   ◯  ÷  ◯

Full details of our pocket book can be found by clicking Mathelona. 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 & 6th rows contain the following fourteen numbers:

2   5   9   12   14   15   18   20   22   33   40   49   56   72

Which three different numbers on the list have a sum of 100? The Factors Challenge

Which of the following numbers are factors of 283?

3     5     7     9     11     13     None of them The Mathematically Possible Challenge

Using 27 and 10 once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below?

1    4    9    16    25    36    49    64    81    100

#SquareNumbers The Target Challenge

Can you arrive at 283 by inserting 2, 3, 4, 5 and 6 into the gaps below?

•  (◯×)+◯³+◯³–◯³ = 283   