# Monthly Archives: August 2018

## DAY 244:

The Main Challenge Consider all odd numbers from 1 to 23. Eliminate all single-digit numbers and multiples of 7 as well as numbers that have their two digits adding up to an even number. Which number is the only one … Continue reading

## DAY 243:

The Main Challenge We invite you to use seven 3’s (3 3 3 3 3 3 and 3) once each, with + – × ÷ available, to make various target numbers. For instance, to make 1 and 2, you could do: 3 × (3÷3) – (3÷3) – (3÷3) … Continue reading

## DAY 242:

The Main Challenge If the number sequence 4 10 16 22 28 . . . is continued, which is the only number from the following list that will NOT appear later in the sequence? 64    70    74    76    … Continue reading

## DAY 241:

The Main Challenge You’ve rolled the numbers 3, 5 and 6 with three dice.  Using these once each, with + – × ÷ available, which three target numbers from 1-10 are NOT possible to make? Visit Roll3Dice.com and the hashtag #Roll3Dice for details. The 7puzzle … Continue reading

## DAY 240:

The Main Challenge Following on from DAY 187, here’s another one of the unique Keith Number challenges. This was made famous by Mike Keith and if you like playing around with numbers, you’ll love having a go at this fun concept. … Continue reading

## DAY 239:

The Main Challenge Three UNIQUE digits from 1-9 must be used to arrive at a specified target number by multiplying two numbers together and either adding or subtracting the third number. Today, your goal is to make 19.  The three numbers … Continue reading

## DAY 238:

The Main Challenge Here’s a 12-step number trail involving + – × ÷ and the numbers 4 and 5. Start with the number 5, then: +5 ÷5 multiply by 4 subtract 4 ×5 add 5 divide by 5 add 4 –5 ÷4 … Continue reading

## DAY 237:

The Main Challenge There are two sets of three consecutive numbers, in ascending order, whose sum is less than 50 and follow this sequence:   triangular number – square number – prime number Can you list both sets of numbers? … Continue reading