Author Archives: 7puzzle

The Main Challenge Clues are given to help you find a particular number from the following facts: I am represented by just one word when written in English, On one side of me is a multiple of 3, on the other … Continue reading →

The Main Challenge Here’s a number trail involving 12 arithmetical steps. Start with the number 21, then: 1/3 of this multiply by seven +23 ÷3 +75% +5 –7 Find 10% of this Square this +2 Double this Square root of … Continue reading →

The Main Challenge Which of these 3-digit numbers is NOT a multiple of 3? 123      234      345     456     567     678     789     890 The 7puzzle Challenge The playing … Continue reading →

The Main Challenge Try the following Mathelona challenge by placing the digits 0 1 1 2 3 3 4 4 5 6 7 and 7 into the 12 gaps below and making all three lines work out arithmetically. ◯  +  ◯   = … Continue reading →

The Main Challenge . . . is a tricky number puzzle from Mathematically Possible, our board game that is great for arithmetic and strategy: Using the numbers 4, 5 and 10 once each, with + – × ÷ available, can you list … Continue reading →

The Main Challenge . . . involves making 7 when using the four numbers 0.7, 1.6, 2 and 10 once each, and with the four arithmetical operations + – × ÷ available. Can you arrive at our signature target answer of 7? The 7puzzle … Continue reading →

The Main Challenge Each of these three numbers is the product of three consecutive whole numbers: 120       210       336 What is the next number in this sequence? The 7puzzle Challenge The playing board of the … Continue reading →

The Main Challenge If you eliminated multiples of 3, 5 and 7 from this list: 12   14   18   21   25   28   30   33   35   36   40   42   44   48   54   55   56   60 which is the ONLY number that would … Continue reading →

The Main Challenge Here is an interesting logic puzzle for you to try. Insert the numbers 1-9 into the correct positions in this 3-by-3 grid after studying the seven clues below. Each number should appear exactly once. x         … Continue reading →

The Main Challenge This is a number trail involving ten arithmetical steps. Be careful with your calculations – and no calculators please! Start with the number 40, then: multiply by 4 +10% subtract 15 divide by seven add nine 1/2 of this … Continue reading →