Monthly Archives: June 2019

The Main Challenge Your task is to arrive at the target numbers 66, 77, 88 and 99 by using the five numbers 1, 2, 3, 4 and 5 once in each calculation, and with + – × ÷ available. The 7puzzle Challenge … Continue reading →

The Main Challenge This is a continuation of a number puzzle, posted on DAY 10, made famous by French writer, George Perec. In that challenge, we asked you to use seven 7’s (7, 7, 7, 7, 7, 7 and 7) once … Continue reading →

The Main Challenge You must make all three lines work out arithmetically by inserting the twelve digits 0 1 1 2 2 3 4 4 5 6 8 and 8 into the gaps below: ◯  +  ◯   =    6 … Continue reading →

The Main Challenge Can you arrive at the target answer of 7 by using each of the numbers 0.2, 0.5, 2 and 2.5 exactly once each, and with + – × ÷ available? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 … Continue reading →

The Main Challenge You must try and make all three lines work out arithmetically by inserting the twelve digits 0 0 1 1 2 3 3 4 5 6 6 and 7 into the gaps: ◯  +  ◯   = … Continue reading →

The Main Challenge You have been given the task of manually numbering a 100-page document from 1 to 100. What is the total of all the individual digits written? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid of 49 … Continue reading →

The Main Challenge Three people answered the same four multiple choice problems. They had a choice of A, B or C for each question. Their responses are shown here: Timmy:    A  B  B  C Tammy:   A  C  B  A … Continue reading →

The Main Challenge Read the facts below: I am a 2-digit number, I am a multiple of 7, The difference between my two digits is 4. Which number am I? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 … Continue reading →

The Main Challenge When allocating each letter of the English alphabet a numerical value as follows; A=1 B=2 C=3 … Z=26, the value of the word SUM, for example, would be 19+21+13 = 53. What would be the value of … Continue reading →

The Main Challenge You are playing our Mathematically Possible board game and have rolled the numbers 6, 6 and 6 with your three dice.  Using these once each, with + – × ÷ available, which SIX target numbers from 1-30 is it possible to make? The 7puzzle … Continue reading →