Monthly Archives: May 2021

day/dydd 151 at 7puzzleblog.com

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

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day/dydd 150 at 7puzzleblog.com

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 numbers, … Continue reading

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day/dydd 149 at 7puzzleblog.com

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

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day/dydd 148 at 7puzzleblog.com

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

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day/dydd 147 at 7puzzleblog.com

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

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day/dydd 146 at 7puzzleblog.com

The Main Challenge Apart from 987631 (9+8+7+6+3+1), can you find the other FOUR ways to 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 numbers, … Continue reading

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day/dydd 145 at 7puzzleblog.com

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

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day/dydd 144 at 7puzzleblog.com

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

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day/dydd 143 at 7puzzleblog.com

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

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day/dydd 142 at 7puzzleblog.com

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

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