# Monthly Archives: May 2019

## DAY/DYDD 151:

The Main Challenge Solve all four lines arithmetically by filling the 16 gaps below with digits 0-9, but each digit must only be inserted a maximum of TWICE in the whole challenge: ◯ + ◯ = 8 … Continue reading

## DAY/DYDD 150:

The Main Challenge Find the sum of the numbers that remain after eliminating multiples of 3, 5 and 7 from all the odd numbers between 10 and 40. The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different … Continue reading

## DAY/DYDD 149:

The Main Challenge You have been given the task of manually numbering a 100-page document from 1 to 100. How many digits will you write altogether? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 … Continue reading

## DAY/DYDD 148:

The Main Challenge What is the lowest whole number that is NOT a multiple of 5, 6, 7, 11 or 13, nor a prime number, square number or cube number? The 7puzzle Challenge The playing board of the 7puzzle game is a … Continue reading

## DAY/DYDD 147:

The Main Challenge Firstly, allocate numerical values to the following fifteen letters in the English alphabet: E=3 F=9 G=6 H=1 I=–4 L=0 N=5 O=–7 R=–6 S=–1 T=2 U=8 V=–3 W=7 X=11 You’ll see that O+N+E adds up to 1 and T+W+O=2 … Continue reading

## DAY/DYDD 146:

The Main Challenge Apart from 987631 (9+8+7+6+3+1), can you find the other FOUR ways you can make 34 when adding together six unique digits from 1-9? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid of 49 different … Continue reading

## DAY/DYDD 145:

The Main Challenge Total the first SEVEN 3-digit numbers that are NOT multiples of 2 or 5. What is your answer? 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 … Continue reading

## DAY/DYDD 144:

The Main Challenge Another mini-Mathelona challenge where your task is to correctly place the eight digits 1 1 1 2 2 3 4 and 5 into the eight gaps so both lines work out arithmetically: ◯ + ◯ = … Continue reading

## DAY/DYDD 143:

The Main Challenge Start with the number 50, then: +27 –42 divide by 5 ×4 +50% two-thirds of this ÷7 = ? What is your final answer to this 7-step number trail? The 7puzzle Challenge The playing board of the … Continue reading

## DAY/DYDD 142:

The Main Challenge From the numbers 1-20, eliminate all: square numbers prime numbers triangular numbers multiples of 6 Add together the numbers that remain; what is your total? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 … Continue reading