The votes are in! Here are our most popular posts from 2021, including news, activities and brainteasers. There’s sure to be something here to tickle your fancy!
Kelly has a pet store. She recently got in a whole litter of puppies and tried to sell them all. On the first day, she sold half of the puppies, plus half a puppy.
Double Helix magazine is excited to announce that we’re merging our newsletters Science by Email and Maths by Email, and adding a splash of technology and engineering news. Keep an eye out for our new look email, called Double Helix Extra!
Fred’s teacher has a weird way of marking tests. He gives five marks for a right answer, but subtracts one for a wrong one. Fred answered 20 questions on a test and got 70 marks. How many questions did Fred get right?
