# Monthly Archives: April 2019

## DAY/DYDD 120:

The Main Challenge Your task is to make the target number of 10 by adding together five numbers. You are limited to using 1 to 5, but these can be used any number of times in each sum. One way … Continue reading

## DAY/DYDD 119:

The Main Challenge Using the numbers 3, 6 and 6 just once each, and with + – × ÷ available, which THREE of the following target numbers are NOT mathematically possible to achieve? 1 2 3 4 … Continue reading

## DAY/DYDD 118:

The Main Challenge Instead of being numbered 1-12, a traditional clock had √1, √4, √9 . . . √144 around its circumference. Every digit is represented on the clock, except one. What is this missing digit? The 7puzzle Challenge The playing board … Continue reading

## DAY/DYDD 117:

The Main Challenge Can you place the 12 numbers 1 1 2 2 3 3 4 5 6 7 8 and 10 into the 12 gaps below so all four lines work out arithmetically? ◯ + ◯ … Continue reading

## DAY/DYDD 116:

The Main Challenge All of the following 3-digit numbers are divisible by 3, but only one is also a multiple of 9. Which one? 237 276 303 336 495 528 582 660 744 771 888 939 [Note: Get in touch … Continue reading

## DAY/DYDD 115:

The Main Challenge Start with the number 6, then: +2 ÷4 +1 ×4 –1 ×5 –16 ×2 –19 +1 ÷10 +7 ×4 –16 ÷3 –1 ×5 –8 ×2 +7 = ? What is the final answer to this 20-step number … Continue reading

## DAY/DYDD 114:

The Main Challenge Can you place the numbers 1 2 3 4 5 6 8 9 10 11 12 and 13 into the 12 gaps below so all four lines work out arithmetically? ◯ + ◯ = … Continue reading

## DAY/DYDD 113:

The Main Challenge Here is a unique 7-part question. Answer all seven parts: (4 + 3) + (2 – 1) = ? (4 × 3) ÷ (1 × 1) = ? (4 – 3) × (2 ÷ 1) = ? (3 + 3) ÷ (2 × 1) = … Continue reading

## DAY/DYDD 112:

The Main Challenge If you multiply a mystery number by 6 and then subtract 6, the result is the same as if you first multiplied the same mystery number by 3 and then added 3. Is the value of this mystery number 1, … Continue reading

## DAY/DYDD 111:

The Main Challenge This describes a particular number less than 100: its digits add up to 12, if the unit digit is subtracted from the tens digit, then doubled, the answer is also 12. What is the number? The 7puzzle Challenge … Continue reading