Monthly Archives: June 2019

The Main Challenge The two sections below both contain eight letters, A-H. Each letter has an addition calculation attached, all involving 2-digit numbers. Which is the only letter that has exactly the same answer in both sections? Section 1 D:68+18 … Continue reading →

The Main Challenge Find the sum of all the numbers between 5 and 25 that are divisible by 3, 4 or 7. The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from 2 up to 84. The 2nd … Continue reading →

The Main Challenge This number trail has seven arithmetical steps. Start with the number 49, then: √    add nineteen    50% of this    –2    +26    subtract nine    ÷7    =   ? What is your … Continue reading →

The Main Challenge Which THREE different prime numbers have a sum of 40? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from 2 up to 84. The 4th & 6th rows contain the following fourteen numbers: 3  … Continue reading →

The Main Challenge You have 12 balls and each ball is numbered differently from 1 to 12.  They are randomly placed into two bags so each bag contains the six numbered balls shown below: Red bag:   2 3 4 6 9 11 … Continue reading →

The Main Challenge Fill the 15 gaps below with the numbers 1-15, once each, so all five lines work out: ◯   +   ◯   =   ◯ ◯   +   ◯   =   ◯ ◯   + … Continue reading →

The Main Challenge Here’s a mini-Mathelona challenge where you must place the eight digits 0, 1, 1, 2, 2, 2, 3 and 4 into the eight gaps so both lines work out arithmetically: ◯  +  ◯   =    4   … Continue reading →

The Main Challenge Three DIFFERENT digits from 1-9 must be used in a particular way to arrive at a specified target number. The rule is to multiply two numbers together, then either add or subtract the third number, so you arrive at … Continue reading →

The Main Challenge Read the following five clues:  I am a 2-digit number,  My 1st digit is bigger than my 2nd digit,  I am less than 50,  I am an odd number,  I am not a prime number. Which number … Continue reading →

The Main Challenge Can you make all three lines work out arithmetically by placing the numbers 1, 2, 3, 4, 5, 6, 10, 11 and 12 into the nine gaps below? ◯   +   ◯   =   ◯◯   +   ◯ … Continue reading →