Monthly Archives: June 2018

DAY 165:

The Main Challenge In this Kakuro-type question, can you list the only THREE ways of making 18 when adding together five unique digits from 1-9? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from 2 up to 84. The 4th … Continue reading

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DAY 164:

The Main Challenge You have 12 balls and each ball is numbered differently from 1 to 12.  They are randomly placed into two bags so each bag contains the six numbered balls shown below: Red bag:   2, 3, 4, 6, 9, 11 … Continue reading

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DAY 163:

The Main Challenge Fill the 15 gaps below with the numbers 1-15, once each, so all five lines work out: ◯   +   ◯   =   ◯ ◯   +   ◯   =   ◯ ◯   + … Continue reading

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DAY 162:

The Main Challenge Here’s a mini-Mathelona challenge where you must place the eight digits 0, 1, 1, 2, 2, 2, 3 and 4 into the eight gaps so both lines work out arithmetically: ◯  +  ◯   =    4   … Continue reading

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DAY 161:

The Main Challenge Three unique digits from 1-9 must be used in a particular way to arrive at a specified target number. The rule is to multiply two numbers together, then either add or subtract the third number, so you arrive at … Continue reading

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DAY 160:

The Main Challenge Read the following five clues:  I am a 2-digit number,  My 1st digit is bigger than my 2nd digit,  I am less than 50,  I am an odd number,  I am not a prime number. and work … Continue reading

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DAY 159:

The Main Challenge Can you make all three lines work out arithmetically by placing the numbers 1, 2, 3, 4, 5, 6, 10, 11 and 12 into the nine gaps below? ◯   +   ◯   =   ◯◯   +   ◯ … Continue reading

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DAY 158:

The Main Challenge Here’s a 10-step number trail involving all four arithmetical operations together with the numbers 1, 2 and 3. Starting with 10, carry out the following steps: add 2 ×1 ÷3 –2 multiply by 3 +1 subtract 3 divide … Continue reading

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DAY 157:

The Main Challenge Using each of the decimal numbers 0.1, 0.2, 0.3 and 0.4 once only, and with the four arithmetical operations + – × and ÷ available, show how you can arrive at the target answer of 7. The 7puzzle Challenge The playing board … Continue reading

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DAY 156:

The Main Challenge Can you make all four lines work out arithmetically by replacing the 16 ◯’s with the digits 0-9 in our latest Mathelona challenge? ◯  +  ◯   =    10    =   ◯  +  ◯ ◯  +  ◯   … Continue reading

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