13th January 2006 at 00:00
Puzzles to test mathematical skills, set by Anita Straker. Solutions below More brainteasers on

24-hour clock

Clues across:

1. 22 minutes past one am

5. Half past eight in the evening

6. Six minutes to 3pm

7. One minute before 7pm Clues down:

1. Eleven minutespast 2am

2. Twelve minutes before 11am

3. 5 minutes before midnight

4. 11 minutes before 9pm


Using the same digit exactly three times, make two expressions to give the answer 24. For example, using three 2s we can get:

22 + 2 = 24

Now do it for the digits 1,3,4,5,6,7,8 and 9.

You can use the signs +, - , x, V, integers or decimals, powers or roots, and factorials.

Remember that: factorial 4 is written as 4! and means 4 x 3 x 2 x 1 = 24; and point four recurring is written as .* 4 and equals four ninths.

Log-in as an existing print or digital subscriber

Forgotten your subscriber ID?


To access this content and the full TES archive, subscribe now.

View subscriber offers


Get TES online and delivered to your door – for less than the price of a coffee

Save 33% off the cover price with this great subscription offer. Every copy delivered to your door by first-class post, plus full access to TES online and the TES app for just £1.90 per week.
Subscribers also enjoy a range of fantastic offers and benefits worth over £270:

  • Discounts off TES Institute courses
  • Access over 200,000 articles in the TES online archive
  • Free Tastecard membership worth £79.99
  • Discounts with Zipcar,, Virgin Wines and other partners
Order your low-cost subscription today