Grandmother has 12 cakes. Tim eats half of them. Then Peter eats one third of the remaining cakes. Grandmother eats all that are left. How many cakes does Grandmother eat?
Mai buys some cakes. She pays with four 2-euro coins and receives one 50-cent coin as change. Each cake costs 1 euro 50 cents. How many cakes does she buy?
Three’s household grows four potted cacti, named 1, 2, 4 and 5. The pictures show the plants without their names. Three especially likes plant 1 and gives a clue for Mother to identify it: replacing each plant in the subtraction by its name gives a correct calculation. Which plant is number 1?
The picture shows 9 squares. First Ani replaces every black square with a white square. Then Bob replaces every grey square with a black square. Finally Chris replaces every white square with a grey square. What do the 9 squares look like at the end?