Author Archives: 7puzzle

The Main Challenge Here’s another selection of mental arithmetic questions.  Can you answer all seven correctly?  (10 + 10) – (15 – 3) = ?  What is the sum of 0.83 and 0.89?  What is 1 × 9?  If Ben earns £10 every … Continue reading →

The Main Challenge Here’s a 7-part challenge to test your basic arithmetic knowledge:  What is 56 divided by 14?  (1 + 11) + (20 – 4) = ?  Find which one of these is a factor of 14. Is it 3, 5, … Continue reading →

The Main Challenge Can you place the 16 numbers 0 0 1 1 2 2 3 4 4 5 6 7 7 8 9 9 into the 16 gaps below so all four lines work out arithmetically? ◯  +  ◯   … Continue reading →

The Main Challenge Using each of the numbers 0.5, 1, 1.5 and 2 once each, with the four arithmetical operations + – × ÷ available, can you arrive at the target answer of 7? For the number puzzle enthusiast, can you find a 2nd … Continue reading →

The Main Challenge Starting from ONE, what is the 7th whole number, when written in English, that does NOT contain the letter ‘E’? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from … Continue reading →

The Main Challenge Read the following ten clues about a particular number: it’s less than 100, it’s one more than a multiple of 3, exactly one of its two digits is prime, you get a prime if you reverse its digits, … Continue reading →

The Main Challenge There are two rules to consider when calculating the NEXT number in our special sequence:  if it’s EVEN, halve it  if it’s ODD, add 1 For example, if starting at 50, the sequence would be:   50   … Continue reading →

The Main Challenge When each letter of the English alphabet is given a numerical value, A=1 B=2 C=3 . . . Z=26, and the values of the individual letters are added together, which day of the week has the highest total and … Continue reading →

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

The Main Challenge Can you place the numbers 0 1 1 2 2 3 3 4 6 6 7 and 7 into the 12 gaps below so that all three lines work out arithmetically? ◯  +  ◯   =   … Continue reading →