Author Archives: 7puzzle

Today’s Challenge Can you arrive at the target number of 47 by using all five numbers 1, 2, 3, 4 and 5 exactly once each?  Remember, you have + – × and ÷ available to use in your calculation. The 7puzzle Challenge The … Continue reading →

Today’s Challenge Each of the five numbers below is the product of two prime numbers: 15       35       77       143       323 Which is the odd one out, and why? … Continue reading →

Today’s Challenge Three UNIQUE digits must be used to arrive at the target number 37. The rule – players must multiply two numbers together, then either add or subtract the third number to achieve the target answer of 37. Using the formula (a×b)±c, … Continue reading →

Today’s Challenge Try the following MATHELONA challenge, just like the ones in my number puzzle pocket book.  Further details can be found by clicking on MATHELONA. Your task is to make all three lines work out arithmetically by replacing the 12 ◯’s below with … Continue reading →

Today’s Challenge You’ve rolled the numbers 1, 3 and 3 with your three dice.  Using these once each, with + – × ÷ available, find the TWO target numbers from 1-10 that it is not possible to make. Visit Roll3Dice.com and the hashtag #Roll3Dice for … Continue reading →

Today’s Challenge Group the following numbers into three lots of three so the products of each of the triples are the same. What is this product? 3      4      5      6      7   … Continue reading →

Today’s Challenge The ten letters, A-J, in the following two sections each contains a calculation.  Which is the only letter that has the same answer in both sections? Section 1 E:6÷6   I:5+1   G:3+2   A:10–2   J:4+3   C:5×1   … Continue reading →

Today’s Challenge Read the following facts: I am a 2-digit number, both my digits are odd, the sum of both digits is less than 10, my 1st digit is smaller than my 2nd digit, and I am a multiple of 3. Which … Continue reading →

Today’s Challenge From all the odd numbers in the range 1-23 inclusive, eliminate all prime numbers and multiples of 3. Which is the only number to remain? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 … Continue reading →

Today’s Challenge What is the sum of the first seven 2-digit even numbers? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84. The 3rd & 4th rows of the playing … Continue reading →