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A recipe for making ice cream requires 1 litre of milk. Unfortunately, you only have an empty 5-litre bucket and an empty 3-litre bottle. How will you measure just 1 litre of milk for your recipe?

In two hours from now, it will take half as many hours until noon as it would be if it was just one hour from now. What’s the time right now?

Kim has a big round cheese, and an even bigger knife. With three straight cuts, what’s the largest number of pieces she can cut?

An adventurous snail decides to climb up a wall to the roof of a school. The snail can climb up 3 metres in a day but slides back down 2 metres at night! If the school is 12 metres tall, how many days will it take the snail to reach the roof?

Sam arrives first to her after school Maths Club meeting. She discovers that her teacher has left a basket of Valentine’s Day chocolates. It comes with the instructions to share the chocolate evenly among the six students in the club… but Sam eats a few chocolates before anyone notices!

Rita is making lamingtons for her birthday party and cuts them precisely into 5-centimetre cubes. While playing around with an antique balance scale, she discovers that one lamington is equal to 50 grams plus half a lamington. At her party, she eats one and a half lamingtons. How much did Rita’s dessert weigh?

Double Helix Extra readers really got busy with brainteasers in 2024! Let’s do a count down of your top 5…

Here are eight 8s, 8 8 8 8 8 8 8 8. Put some plus signs in there to make 1000.

We’ve written a code using two different prime numbers less than 10. We then multiplied these two primes and used the resulting “code number” to shift the alphabet forward to new letters. Can you use the clues above to decode this message: DRO QYVN SC LEBSON SX DRO QKBNOX.

Right before the bell rings, Jeri’s teacher throws up a problem on the board: “I’m thinking of a number. When I add its digits together and multiply by seven, I get the number I first thought of. The number is under 40.” Can you help Jeri find the number before class is dismissed?