Category Archives: 7puzzleblog.com

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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DAY 155:

The Main Challenge Can you arrive at the target number 81 by using the five numbers 1, 2, 3, 4 and 5 exactly once each, and with + – ×  ÷ available? The 7puzzle Challenge The playing board of the 7puzzle game is a … Continue reading

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DAY 154:

The Main Challenge From the following list of eighteen numbers, eliminate all square numbers, multiples of 8, factors of 60 and prime numbers. 3  4  7  10  11  15  16  17  24  27  30  32  36  48  49  54  56  … Continue reading

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