By Ariel Marcy, 19 November 2024
Farmer Doolittle has a farm with just cows and chickens. The farmer counts up all the animals and discovers that there are 43 heads and 120 legs on the farm (not counting the farmers). How many cows live on farmer Doolittle’s farm?
Categories:
By Ariel Marcy, 5 November 2024
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.
By Evrim Yazgin, 31 October 2024
The biggest ever prime number has just been found and it’s absolutely massive. It’s a number with more than 41 million digits. That means, if you were to type it out in size 12 font, it would be more than 8,000km long! That’s about the distance from Melbourne to Tokyo.
By Ariel Marcy, 23 October 2024
Rosario has a pink square of origami paper. She then folds one corner all the way to the square’s centre to make a new 5-sided shape. She discovers that the missing corner is exactly the same size as a piece of fairy bread! How many pieces of fairy bread would it take to cover the whole 5-sided shape?
By Ariel Marcy, 9 October 2024
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?
By Ariel Marcy, 24 September 2024
Can you solve this grid-based logic puzzle about NASA? You are doing a science project about four of NASA’s spacecraft: Clipper, DAVINCI, Dragonfly and MAVEN. Each spacecraft will visit another planet in the solar system: Venus, Mars, Jupiter and Saturn. They also have different launch dates: 2013, 2024, 2028 and 2030.
By Ariel Marcy, 10 September 2024
A team of geologists are using the latest technology to drill into the Earth’s ocean floor and look at the rock underneath! They manage to drill a total of 1250 metres (based on a recent true story!). But the drilling gets harder the deeper they get.
By David Shaw, 29 August 2024
Eight people come together for a very important meeting. How many ways can just one person sit in the wrong chair?
By David Shaw, 20 August 2024
This quiz looks at some of the shapes found in maths and science. Give it a go and see how you shape up!
By Ariel Marcy, 13 August 2024
In this puzzle, each Aussie animal stands for a number. Each animal represents the same number throughout the puzzle. Can you use the first three mathematical equations to figure out the answer to the last equation?
12 months, 8 issues
Print & digital subscriptions available.
Sign up to our Double Helix newsletter
Stay in touch with new updates by signing up to our free newsletter
Perfect for ages 8 – 14
Developed by experienced editors
Engaging and motivating
*84% of readers are more interested in science
Engaging students voice