Monthly Archives: May 2019

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

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WELCOME/CROESO

A warm Welsh welcome to 7puzzleblog.com and our compendium of daily number puzzles. Five challenges are posted each day, seven days a week, and designed for our many followers from nearly 170 countries & territories throughout the world. As well as our ever-expanding website … Continue reading

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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

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DAY/DYDD 141:

The Main Challenge One of our easier Mathelona-style challenges, still utilising the four arithmetic operations.  Place the eight digits 1 2 2 3 4 4 5 and 6 into the gaps so both lines work out: ◯  +  ◯   =   … Continue reading

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DAY/DYDD 140:

The Main Challenge Group the following numbers into three groups of three so that the sum of each of the triples are the same. What is this sum? 11    25    35    43    51    63    … Continue reading

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DAY/DYDD 139:

The Main Challenge There are two sections below, both containing ten letters, A-J.  Each letter is linked to a division calculation: Section 1 D:9÷3  H:8÷2  B:12÷3  I:8÷4  A:4÷2  E:24÷6  G:15÷5  C:20÷4  F:25÷5  J:7÷7 Section 2 I:6÷2  G:6÷3  D:10÷2  E:12÷4  J:14÷7  B:20÷5  A:18÷6  … Continue reading

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DAY/DYDD 138:

The Main Challenge The two sections below both contain ten letters, A-J; each of which has a multiplication calculation assigned to it: Section 1 C:10×2  J:4×3  F:8×5  D:3×3  I:3×2  G:7×4  B:5×4  H:9×4  E:10×3  A:6×4 Section 2 B:12×2  D:6×1  G:8×3  J:5×2 … Continue reading

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DAY/DYDD 137:

The Main Challenge It is possible to use seven 5’s (5 5 5 5 5 5 and 5) once each, with the four operations + – × ÷, to make all the target numbers from 1 to 5. For instance, to … Continue reading

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DAY/DYDD 136:

The Main Challenge Can you arrive at the target number 55 by using the five numbers 1, 2, 3, 4 and 5 exactly once each, and with + – ×  ÷ available? The 7puzzle Challenge The playing board of the 7puzzle … Continue reading

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DAY/DYDD 135:

The Main Challenge Here’s a number trail involving 16 arithmetical steps.  Start with the number 2, then:  +33  divide by seven  ×3  add ten percent  double this  add three  find the square root of this  +7  1/2 of this  add … Continue reading

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