Monthly Archives: August 2020

DAY/DYDD/GIORNO/NAP 244:

The Main Challenge Consider all odd numbers from 1 to 25. Eliminate all single-digit numbers, square numbers and multiples of 7 as well as numbers that have their two digits adding up to an even number. Which number is the … Continue reading

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DAY/DYDD/GIORNO/NAP 243:

The Main Challenge We invite you to use seven 3’s (3 3 3 3 3 3 and 3) once each, with + – × ÷ available, to make various target numbers. For instance, to make 1 and 2, you could do: 3 × (3÷3) – (3÷3) – (3÷3) … Continue reading

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DAY/DYDD/GIORNO/NAP 242:

The Main Challenge If the number sequence 4 10 16 22 28 . . . is continued, which is the only number from the following list that will NOT appear later in the sequence? 64    70    74    76    … Continue reading

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DAY/DYDD/GIORNO/NAP 241:

The Main Challenge You’ve rolled the numbers 3, 5 and 6 with three dice.  Using these once each, with + – × ÷ available, which THREE target numbers from 1-10 are not possible to make? The 7puzzle Challenge The playing … Continue reading

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DAY/DYDD/GIORNO/NAP 240:

The Main Challenge Following on from DAY 187, here’s another one of the unique Keith Number challenges. This was made famous by Mike Keith and if you like playing around with numbers, you’ll love this fun concept. The 1st 2-digit Keith … Continue reading

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DAY/DYDD/GIORNO/NAP 239:

The Main Challenge Three UNIQUE digits from 1-9 must be used to arrive at today’s target number, 19, by multiplying two numbers together and either adding or subtracting the third number. One way to make 19 is (7×2)+5, can you find … Continue reading

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DAY/DYDD/GIORNO/NAP 238:

The Main Challenge Here’s a 12-step number trail involving + – × ÷ and the numbers 4 and 5. Start with the number 5, then: +5 ÷5 multiply by 4 subtract 4 ×5 add 5 divide by 5 add 4 –5 ÷4 … Continue reading

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DAY/DYDD/GIORNO/NAP 237:

The Main Challenge A young mathematician originally from Nigeria called Chika, who now lives in London, has come up with a brilliant way of testing whether a number is divisible by 7. Multiply the unit digit by 5. Keep the … Continue reading

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DAY/DYDD/GIORNO/NAP 236:

The Main Challenge Study the seven clues below and place the numbers 1-9 into the nine positions of the grid. Each number should appear exactly once. x              x             … Continue reading

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DAY/DYDD/GIORNO/NAP 235:

The Main Challenge You’ve rolled the numbers 4, 5 and 5 with three dice.  Using these once each, with + – × ÷ available, find the only FOUR target numbers from 1-10 that it is possible to make. The 7puzzle Challenge The playing board of the 7puzzle game is a … Continue reading

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