DAY 340:

The Main Challenge

List the only two numbers below 100 that have exactly 10 factors.

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 & 7th columns contain the following fourteen numbers:

2   5   9   10   16   24   28   32   33   45   48   50   66   70

What is the sum of the multiples of 9?

The Factors Challenge

Which TWO numbers below are not factors of 340?

2    4    5    8    10    14    17    20    34

The Mathematically Possible Challenge

Using 29 and 12 once each, with + – × ÷ available, which is the ONLY number that is possible to make from the list below?

12    24    36    48    60    72    84    96    108    120

#12TimesTable

The Target Challenge

Can you arrive at 340 by inserting 3, 4, 5, 10 and 17 into the gaps below?

  •  ◯×◯×(◯+◯)÷◯ = 340

Answers can be found here.

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