Monthly Archives: March 2021

DAY/DYDD/PÄIVÄ/NAP 70

The Main Challenge Using the numbers 1, 4 and 6 once each with + – × ÷ available, list the SIX numbers that are mathematically possible to make in the range 20 to 30 inclusive. The 7puzzle Challenge The playing board of the 7puzzle … Continue reading

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DAY/DYDD/PÄIVÄ/NAP 69

The Main Challenge If the number sequence  5  9  13  17  21 . . .  is continued, which is the only number from the following list that appears later in the sequence? 35    43    59    67    71  … Continue reading

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DAY/DYDD/PÄIVÄ/NAP 68

The Main Challenge Can you arrive at the target number 105 in two different ways when using the five numbers 1, 2, 3, 4 and 5 once in each calculation, and with + – ×  ÷ available? The 7puzzle Challenge The … Continue reading

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DAY/DYDD/PÄIVÄ/NAP 67

The Main Challenge Can you correctly place 0 1 1 2 2 3 4 5 5 8 9 and 9 into the 12 gaps below? ◯  +  ◯   =    3    =   ◯  –  ◯ ◯  + … Continue reading

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DAY/DYDD/PÄIVÄ/NAP 66

The Main Challenge When multiplying two numbers together and then adding or subtracting a third number, there are four ways of reaching 60 when the three numbers used in each calculation are in the range 1-9, and can be repeated. One way … Continue reading

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DAY/DYDD/PÄIVÄ/NAP 65

The Main Challenge You must arrive at the target number of 24 by using four unique numbers from 10-19 and with + – × ÷ available to use; one such example being (15×12÷18)+14 = 24. Can you derive another 4-number combination to make 24? … Continue reading

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DAY/DYDD/PÄIVÄ/NAP 64

The Main Challenge From the numbers 1-30, eliminate the following: numbers containing the digit 1 prime numbers numbers in the 20’s factors of 72 What is the only number that remains? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 … Continue reading

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DAY/DYDD/PÄIVÄ/NAP 63

The Main Challenge Which is the only digit not represented when listing the square numbers from 10² to 19²? 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 2nd & 7th … Continue reading

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DAY/DYDD/PÄIVÄ/NAP 62

The Main Challenge When listing the FIVE 3-digit cube numbers, all digits from 1 to 9 are represented, except one. Which digit is missing? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from 2 up … Continue reading

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DAY/DYDD/PÄIVÄ/NAP 61

The Main Challenge Read the information below to find each of these three different numbers:  A is the only 2-digit square number that does not contain any odd digits  B is the only 2-digit prime number with both its digits the same  C is the only 2-digit … Continue reading

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