# Monthly Archives: February 2020

## DAY/DYDD/GIORNO/NAP 50:

The Main Challenge Using the numbers 4, 5 and 6 once each, together with + – × ÷, which THREE target numbers from the following list are NOT mathematically possible to make? 2    3    4    5    6    … Continue reading

## DAY/DYDD/GIORNO/NAP 49:

The Main Challenge You roll two normal six-sided dice, both containing the numbers 1-6.  When multiplying the two numbers that show, how many DIFFERENT answers is it possible to obtain? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid … Continue reading

## DAY/DYDD/GIORNO/NAP 48:

The Main Challenge What is the biggest integer (whole number) less than 630,000 that can be written using all six digits 1 to 6? 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

## DAY/DYDD/GIORNO/NAP 47:

The Main Challenge If you multiply a certain number by 3 and then add 30, the result is the same as if you firstly added 17 to this particular number and then multiplied by 2. Which number in the range 1 … Continue reading

## DAY/DYDD/GIORNO/NAP 46:

The Main Challenge The smallest positive integer that has exactly three factors is FOUR; these are 1, 2 and 4. Find the next integer to have just three factors. What is the product of these three factors? The 7puzzle Challenge The … Continue reading

## DAY/DYDD/GIORNO/NAP 45:

The Main Challenge If you multiply two whole numbers together and then add 4, the result is 40. Which one of the following could NOT be the sum of the two whole numbers you initially multiplied? 12      13  … Continue reading

## DAY/DYDD/GIORNO/NAP 44:

The Main Challenge If the number sequence 2, 5, 8, 11, 14 . . . is continued, which is the ONLY number from the following list that will appear later in the sequence? 22   34   43   57   … Continue reading

## DAY/DYDD/GIORNO/NAP 43:

The Main Challenge Using the numbers 2, 4 and 6 once each, together with + – × ÷, find the SIX target numbers from the following list that are mathematically possible to make: 12    14    16    18    20  … Continue reading

## DAY/DYDD/GIORNO/NAP 42:

The Main Challenge You’ve rolled the numbers 2, 4 and 6 with three dice.  Using these once each, with + – × ÷ available, find the THREE target numbers from 1-10 that it’s not possible to make. The 7puzzle Challenge The playing … Continue reading

## DAY/DYDD/GIORNO/NAP 41:

The Main Challenge When a certain 4-digit number is multiplied by 4, its digits appear in reverse order. It also has both of these properties:  its first digit is a quarter of the last one, and  its second digit is … Continue reading