Grade 1-3:

Question: A baby saltwater crocodile hatches from its egg with black stripes. After 48 months, the stripes disappear. How many years old is the crocodile when it loses its stripes?

Grade 4-6:

Question: A platypus eats ¹/₄ of a kilogram of worms each day. If a platypus has eaten 75 grams of worms, what fractional part of its daily worm intake has it consumed?

Grade 7-9:

Question: When a baby kangaroo is born, it’s only 2 centimetres long from snout to tail. An adult kangaroo is 2¹/₄ metres long. What percentage of the adult kangaroo’s length is the baby kangaroo?

Grade 10-12:

Question: Koalas have very small brains. An adult koala that weighs 20 pounds has a brain that weighs ³/₄ of an ounce. A typical human brain-to-body weight ratio is 1:40. What is the koala’s brain-to-body weight ratio? How does the koala’s brain-to-body ratio compare to the human’s as a fraction?