# DAY 360: The Main Challenge

Players must multiply two numbers together, then either add or subtract the third number to achieve your target answer of 25, so the formula is (a×b)±c, where a b c are three UNIQUE digits from 1-9.

One way of achieving 25 is (8×2)+9, can you find the other EIGHT ways?

[ Note:  (8×2)+9 = 25  and  (2×8)+9 = 25 counts as just ONE way ] 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 3rd column contains the following seven numbers:

4     12     15     17     35     80     81

Using these seven numbers exactly once each, with + – × ÷ available to use in your calculation, can you arrive at the target number of 100? The Factors Challenge

Which FIVE numbers below are factors of 360?

10    11    12    13    14    15    16    17    18    19    20 The Mathematically Possible Challenge

Using 48 and 12 once each, with + – × ÷ available, which are the only TWO numbers it is NOT possible to make from the list below?

8    16    24    32    40    48    56    64    72    80

#8TimesTable The Target Challenge

Can you arrive at 360 by inserting 3, 5, 10, 12 and 20 into the gaps below?

•  ◯××◯×◯÷◯ = 360 Answers can be found here. Click Paul Godding for details of online maths tuition. This entry was posted in 7puzzleblog.com. Bookmark the permalink.

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