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What is the area of the orange star in the centre? The blue circles each have an area of 3 square centimetres, and the big square has sides that are 4 centimetres long.

Jing is taking her submarine to the bottom of an ocean trench. The first day she goes half the distance to the bottom of the trench.

Time for a tricky triangle teaser! If the purple shaded triangle has an area of 2, what is the area of the largest triangle?

Difficulty: Extreme 123,456,789 is not a prime number. Is it possible to reorder its digits to give a prime number?

Difficulty: Extreme! George bought a bag of 70 lollies on Monday. He didn’t eat many on Monday, but he really liked the flavour. Every day after that he ate three more lollies than he had the previous day. The next Monday, George was about to eat his first lolly for the day and noticed the […]

Difficulty: Fun Jane has some Australian silver coins in her pocket. When buying an apple, she realises she has more than $1 in silver coins, but can’t make exactly $1 with her coins. How is this possible? (Silver Australian coins come in 5c, 10c, 20c, and 50c.)

Difficulty: Fun While Eddie is away on holidays his swimming pool has a leak. Each day it loses half the water still in the pool. Normally, it’s 1.6 metres deep, but when Eddie gets home there is only 10 centimetres of water in the bottom. How long has the pool been leaking?

Santa sent out 2 sleigh teams. One goes east, and the other goes west, until they meet. how far away from home are they when they meet?

Three new chocolate brands are being released: Jupiter, Astro, and Celeste. can you use up all the ingredients to make these bars?

Difficulty: Tricky A new class of aliens is due to start at Alien Academy. The teachers need to know the age of each alien, but can’t contact them. Luckily, they have a few clues to help them. There are five aliens (Filp, Agg, Nim, Phod, and Mex) and each alien is a different age (7, […]