Monthly Archives: April 2022

The Main Challenge Your task is to make the target number of 10 by adding together five numbers. You are limited to using 1 to 5, but these can be used any number of times in each sum. One way … Continue reading →

The Main Challenge Using the numbers 3, 6 and 6 just once each, and with + – × ÷ available, which THREE of the following target numbers are NOT mathematically possible to achieve? 1    2    3    4    … Continue reading →

The Main Challenge Instead of being numbered 1-12, a traditional clock had √1, √4, √9 … √144 around its circumference. Every digit is represented on the clock, except one. What is the missing digit? The 7puzzle Challenge The playing board of the 7puzzle … Continue reading →

The Main Challenge Can you place the 12 numbers 1 1 2 2 3 3 4 5 6 7 8 and 10 into the 12 gaps below so all four lines work out arithmetically? ◯   +   ◯   … Continue reading →

The Main Challenge All of the following 3-digit numbers are divisible by 3, but only one is also a multiple of 9. Which one? 237  276  303  336  495  528  582  660  744  771  888  939 [Note: Get in touch … Continue reading →

The Main Challenge Start with the number 6, then: +2   ÷4   +1   ×4   –1   ×5   –16   ×2   –19   +1 ÷10   +7   ×4   –16   ÷3   –1   ×5   –8   ×2   +7   =   ? What is the final answer to this 20-step number … Continue reading →

The Main Challenge Can you place the numbers 1 2 3 4 5 6 8 9 10 11 12 and 13 into the 12 gaps below so all four lines work out arithmetically? ◯   +   ◯   = … Continue reading →

The Main Challenge Here is a unique 7-part question. Answer all seven parts:  (4 + 3) + (2 – 1)  =  ?  (4 × 3) ÷ (1 × 1)  =  ?  (4 – 3) × (2 ÷ 1)  =  ?  (3 + 3) ÷ (2 × 1)  =  … Continue reading →

The Main Challenge If you multiply a mystery number by 6 and then subtract 6, the result is the same as if you first multiplied the same mystery number by 3 and then added 3. Is the value of this mystery number 1, … Continue reading →

The Main Challenge This describes a particular number less than 100:  its digits add up to 12,  if the unit digit is subtracted from the tens digit, then doubled, the answer is also 12. What is the number? The 7puzzle Challenge … Continue reading →