# Blog

## Brainteaser: Drilling the distance

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.

Categories:

## The shape of science – a quick quiz

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!

Categories:

## Brainteaser: Animal equations

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?

Categories:

## How to solve a grid-based logic problem

By Ariel Marcy, 17 July 2024

These grid-based logic problems require Sherlock-like deduction! We’ll take you through the basics of solving these tricky word puzzles.

Categories:

## Brainteaser: Walkin’ the perimeter

By Ariel Marcy, 16 July 2024

Lavonne is a security guard who has to walk around the outside of an L-shaped building. She knows the length of the longest sides, 200 metres and 140 metres. She also knows the shape of the building and that each of the angles are 90 degrees. What is the building’s perimeter?

Categories:

## Brainteaser: Chessboard challenge

By Ariel Marcy, 4 July 2024

One day, Rumi’s chess club coach asks her, “how many squares are on a chess board?” Rumi replies, “That’s easy, the board is 8 by 8, so there are 64 squares!” Her coach smiles, “What about the larger squares made up of smaller squares? The board is an 8 by 8 square after all!” How many squares are on a chess board?

Categories:

## Brainteaser: Triangle plus

By Ariel Marcy, 18 June 2024

The teacher challenges Becki and her classmates to find three bottom numbers that follow the pattern and add up to 15. Becki is pretty sure that there are multiple solutions, where the numbers along the bottom appear in different orders. If she keeps at it, how many different solutions will Becki find?

Categories:

## Brainteaser: Magic trick tricks

By Ariel Marcy, 24 April 2024

Miguel hopes to become a magnificent mathematical magician. For his first trick he wants to present a standard 52-card deck and dramatically draw a face card (Jack, Queen or King). If the deck is randomly shuffled, what is the probability that Miguel will draw a face card on the first try?

Categories:

## Massive multiplication

By David Shaw, 10 April 2024

Sienna’s teacher is writing up a wicked problem. First, the teacher writes all the numbers from 1 to 99 and then erases 10, 20, and all the other numbers that end in 0. “Listen up! Multiply all these numbers. Tell me the last digit and I’ll give you full marks on your next assignment.”

Categories:

## Secret pairs

By Ariel Marcy, 12 March 2024

Lavonne is testing a secret code with her friend Jack. First, she picks 3 different secret numbers between 1 and 9. Then she finds the sum of each pair of numbers. Lavonne wants to know if Jack can figure out the original secret numbers just from the sums?

Categories:

## Why choose the Double Helix magazine for your students?

Perfect for ages 8 – 14

Developed by experienced editors

Engaging and motivating

*84% of readers are more interested in science

Engaging students voice