# Author Archives: 7puzzle

## DAY/DYDD 40:

The Main Challenge In all four groups below, it is possible to make 24 by using the four numbers once each, with + – × ÷ available. Can you show how to achieve the target number of 24 in each case? 3 … Continue reading

## DAY/DYDD 39:

The Main Challenge By 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 CAT would be 24, calculated by doing 3+1+20. Following this rule, what … Continue reading

## DAY/DYDD 38:

The Main Challenge Firstly, allocate each letter of the English alphabet a numerical value as follows, A=1 B=2 C=3 . . . Z=26. If the value of the word DOG is 26 by calculating 4+15+7, for example, which TWO of … Continue reading

## DAY/DYDD 37:

The Main Challenge If you add 1+4, then to that answer add 9, then keep on adding consecutive square numbers to the previous total, what is the first answer you reach that is greater than 200? (Hint: Square numbers are … Continue reading

## DAY/DYDD 36:

The Main Challenge You’ve rolled the numbers 2, 3 and 4 with your three dice. Using these once each, with + – × ÷ available, what is the lowest positive whole number it is NOT possible to make? Visit Roll3Dice.com for further details of similar challenges. … Continue reading

## DAY/DYDD 35:

The Main Challenge Try the following 20 steps in your head. Start with the number 12, then: ÷2 –1 ×5 –5 ×3 –6 ÷2 –3 ÷3 ×2 –10 +6 ×3 –6 ÷2 +3 ÷3 +2 –4 ×6 = ? What … Continue reading

## DAY/DYDD 34:

The Main Challenge In this addition-only Mathelona-style puzzle, place the following 12 numbers into the 12 gaps so that all four lines work out: 1 1 2 3 4 4 5 5 6 … Continue reading

## DAY/DYDD 33:

The Main Challenge Using the three numbers 3, 6 and 9 just once each, with + – × ÷ available, THREE of the following target numbers are not possible to make: 3 6 9 12 15 18 21 24 27 30 33 36 … Continue reading

## DAY/DYDD 32:

The Main Challenge Apart from 9+5+1, find the SEVEN other ways you can make 15 when combining and adding together three unique digits from 1-9. The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different … Continue reading

## DAY/DYDD 31:

The Main Challenge Your task is to arrive at the target number of 20 by adding together five numbers. You are limited to using digits 1 to 5 but these can be used any number of times in each calculation. One … Continue reading