# Blog

## 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.

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## 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?

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## Brainteaser: Sharing so much chocolate

By Ariel Marcy, 29 May 2024

Anamaria and Chen are two friends who toured a magical chocolate factory! They both get enormous amounts of chocolate and they want to share it evenly between them. Anamaria gets 1,574,936 squares of chocolate and Chen gets 3,569,321 squares of chocolate. Without using a calculator, can you tell if it is possible for them to share the chocolate between them without breaking any squares?

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## Brainteaser: Patchwork problem

By Ariel Marcy, 21 May 2024

Difficulty: Tricky Jack is making a quilt from only square patches of fabric. For every 4 patches he sews together, 1 patch is blue and 3 patches are red. Once they are added to the quilt, all of the patches are 5 cm in width and length. Jack wants to make a quilt that is […]

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## Brainteaser: Skipping stairs

By Ariel Marcy, 21 March 2024

Flora likes to run up stairs as fast as she can! Sometimes she lands on every stair and sometimes she skips a stair, taking two in one stride. This gets her thinking: how many different ways can she run up a staircase?

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## 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?

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## Artful measuring

By Ariel Marcy, 10 January 2024

Holly loves drawing and her favourite colours have been sharpened a lot. Her most favourite colour, rose, is exactly 3cm long. She discovers that the teal pencil is exactly 4cm, and the almond pencil is exactly 6cm. What lengths from 1-10 cm can Holly make with her pencils?

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## 2023’s Best Brainteasers

By Ariel Marcy, 14 December 2023

In 2023, Double Helix readers busted a bunch of brainteasers! Here are the tippy-top, most popular puzzles of the year.

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## Same, same, same but different

By Ariel Marcy, 6 December 2023

Can you find a different set of 5 positive whole numbers with the same stats?

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

Perfect for ages 8 – 14

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