# Monthly Archives: October 2019

## DAY/DYDD 304:

The Main Challenge One to test your basic adding skills. What is the sum of all twenty-two individual digits when listing all whole numbers from 10-20 inclusive? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing … Continue reading

## DAY/DYDD 303:

The Main Challenge Using 1, 5 and 10 once each, with + – × ÷ available, list the EIGHT different even-numbered target numbers that are possible to make from 2-60. The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid … Continue reading

## DAY/DYDD 302:

The Main Challenge Using 2, 4 and 7 once each, with + – × ÷ available, list the ELEVEN different even-numbered target numbers that are mathematically possible to make from 2-60. The 7puzzle Challenge The playing board of the 7puzzle game is a … Continue reading

## DAY/DYDD 301:

The Main Challenge This number trail contains ten arithmetical steps. Start with the number 40, then: subtract twenty-six ÷7 ×10 30% of this multiply by 3 two-thirds of this ×12 double it add fifteen ÷3 What is your final answer? The 7puzzle … Continue reading

## DAY/DYDD 300:

The Main Challenge Here’s a Mathelona challenge for you to try based on the ones found in my pocket book, details of which can be found by clicking Mathelona. You must make all four lines work out arithmetically by filling the 16 gaps with … Continue reading

## DAY/DYDD 299:

The Main Challenge Which is the only 2-digit number to have exactly SEVEN factors? . . . and an additional challenge for the number puzzle enthusiast; which is the only 3-digit number to have exactly SEVEN factors? The 7puzzle Challenge … Continue reading

## DAY/DYDD 298:

The Main Challenge Read the following facts and work out which number I am today: I am a 2-digit number, One of my digits is odd, the other is even, I have six factors, I am a multiple of 5 … Continue reading

## DAY/DYDD 297:

The Main Challenge This is a typical number puzzle from fellow designer, Kojiro Tominga, who is based in Yokohama, Japan. Using 5, 5, 5 and 5, with + – × ÷ available, can you make each of the target numbers 5, 10, 15, 20, … Continue reading

## DAY/DYDD 296:

The Main Challenge Using any five numbers from 1-5 (more than once each if required) and with + – × ÷ available, can you find THREE different ways to make the target number 86? The 7puzzle Challenge The playing board of the … Continue reading

## DAY/DYDD 295:

The Main Challenge . . . is from Volume 1 of our Mathelona pocket book. You have a limited amount of numbers to work with, so can you make all three lines work out arithmetically by filling the 12 gaps with these numbers? 1 … Continue reading