Monthly Archives: September 2019

DAY/DYDD 262:

The Main Challenge Read the following facts to work out my numerical value:  I am a 3-digit number less than 200  I am a multiple of 11  Add 4 to me and I become a multiple of 5  All my … Continue reading

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DAY/DYDD 261:

The Main Challenge Your task is to make all four lines below work out arithmetically by placing digits from 0 to 9 into the 16 gaps, but each digit can only be used a maximum of twice! Can you complete this Mathelona challenge? … Continue reading

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DAY/DYDD 260:

The Main Challenge All the following 3-digit numbers are divisible by 3, except one.  Which one? 102  111  117  126  132  139  144  153  162  168  174  180 The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid of 49 … Continue reading

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DAY/DYDD 259:

The Main Challenge From the following list of numbers: 12  14  18  21  25  28  30  33  35  36  40  42  44  48  54  55  56 find the ONLY number remaining when you eliminate multiples of 3, 5 and 7. … Continue reading

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DAY/DYDD 258:

The Main Challenge Using the numbers 2, 4 and 10 once each, with + – × ÷ available, can you list the FOURTEEN target numbers from 1-30 that are mathematically possible to achieve? The 7puzzle Challenge The playing board of the 7puzzle game is a … Continue reading

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DAY/DYDD 257:

The Main Challenge When using the numbers 2, 5 and 7 once each, with + – × ÷ available, can you list the TWELVE target numbers from 1-30 that are mathematically possible to achieve? The 7puzzle Challenge The playing board of the 7puzzle game is a … Continue reading

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DAY/DYDD 256:

The Main Challenge Start at 7 and subtract 0.1, followed by 0.2, then 0.3 . . . and so on. What is the first answer less than 1 you will arrive at . . . and the first negative number following that? The 7puzzle … Continue reading

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DAY/DYDD 255:

The Main Challenge Here’s a 2-part, 7-step number trail involving all four arithmetical operations. Part 1: When starting with the number 15, what is your final answer? –1 +2 ×3 ÷4 +5 –6 ×7 Part 2: In a separate calculation, … Continue reading

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DAY/DYDD 254:

The Main Challenge You have been given the task of manually numbering a 100-page document from 1 to 100. Which digit will appear least, and how many times? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid … Continue reading

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DAY/DYDD 253:

The Main Challenge Using the numbers 0.1, 0.6, 3 and 7 once each, with + – × ÷ available, can you arrive at the target number of 7? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 … Continue reading

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