# Monthly Archives: January 2018

## DAY 21:

Today’s Challenge Which is the lowest whole number that is not a multiple of 4, 5 or 6, nor a prime number, square number or cube number? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing … Continue reading

## DAY 20:

Today’s Challenge Consider all whole numbers from 1 to 60, then delete the following: all prime numbers, any number that differs by 1 from a prime, all square numbers, any number that differs by 1 from a square, all multiples of … Continue reading

## DAY 19:

Today’s Challenge Only one of the following 3-digit numbers is divisible by 3. Which one? 136 139 245 248 353 357 466 469 572 578 680 [Note: If you don’t know the trick on how to work this out, please get … Continue reading

## DAY 18:

Today’s Challenge All nine numbers from 21 to 29 inclusive must be allocated to a letter below so that each allocated number satisfies the condition given on the line: (a) even number, (b) factor of 144, (c) power of 3, (d) prime number, … Continue reading

## DAY 17:

Today’s Challenge Find the answer to this large number trail which involves fourteen arithmetical steps and includes fraction and percentage calculations. Start with the number 11, then: double it 50% of this +50 subtract thirty-five ÷2 +37 3/5 of this … Continue reading

## DAY 16:

Today’s Challenge What is the sum of the 50 integers (or whole numbers) from 1 through to 50 inclusive? 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 1st … Continue reading

## DAY 15:

Today’s Challenge Your task is to multiply two numbers together and then subtract a third number to achieve the target answer of 7. The three numbers used in each calculation must all be unique digits from 1-9. For example, one … Continue reading

## DAY 14:

Today’s Challenge Insert the 12 numbers 1, 1, 2, 2, 2, 3, 5, 5, 6, 7, 8 and 8 so that all three lines work out arithmetically: ◯ + ◯ = 6 = ◯ … Continue reading

## DAY 13:

Today’s Challenge Starting from 2, list the first seven even numbers that are NOT multiples of 3, 5 or 7. What is the 7th number in your list? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid containing 49 … Continue reading

## DAY 12:

Today’s Challenge Add together the 7th prime number, the 7th square number, the 7th 2-digit number and the 7th whole number that contains a ‘7’. What is your answer? The 7puzzle Challenge The playing board of the 7puzzle game is a 7-by-7 grid … Continue reading