Monthly Archives: December 2021

The Main Challenge Using the numbers 1, 4 and 10 once each, with + – × ÷ available, can you find the EIGHT whole numbers from 1-30 it is mathematically possible to make? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid … Continue reading →

The Main Challenge If the number sequence  1  10  19  28  37 …  is continued, which is the ONLY number from the following list that will appear later in the sequence? 105   115   125   135   145   155   165   175   185   195 The 7puzzle Challenge The playing … Continue reading →

The Main Challenge From the following Octaplus clues, find the values of the letters A to H, each of which contains a different whole number in the range 1-30:   A is ten lower than the value of G, but … Continue reading →

The Main Challenge Using each of the four numbers 0.5, 0.5, 10 and 12 once each, with the four arithmetical operations + – × ÷ available, can you arrive at the target answer of 7? The 7puzzle Challenge The playing board of the 7puzzle game is … Continue reading →

The Main Challenge Follow the rules below and eliminate every number from a given list, except one. Firstly, list the multiples of 10 from 10 to 100 inclusive, then eliminate: multiples of 4 factors of 100 multiples of 3 Which … Continue reading →

The Main Challenge This is perhaps a bit trickier than you think!  Add these four numbers together and write your answer in words:  Two hundred and four thousand and nine,  Seventy thousand, nine hundred and eight,  Four hundred and fifty thousand … Continue reading →

The Main Challenge This involves one of our favourite puzzles, Kakuro, which is all about addition and number combinations. Your task is to find different ways of making 29 when adding together six UNIQUE digits from 1-9. One such way is 9+8+6+3+2+1; can … Continue reading →

The Main Challenge Using the numbers 4, 4 and 8 once each, with + – × ÷ available, what is the lowest whole number it is not possible to achieve? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 … Continue reading →

The Main Challenge This number puzzle is based on the concept of my FlagMath series of card games. Here is an example of a typical challenge in the Multiplication edition. Each of the nine letters, A-I, in the two sections below contains … Continue reading →

The Main Challenge How many 3-digit numbers contain at least two 7’s? 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 4th & 7th columns contain the … Continue reading →