IKMC 2027 - Grades 3-4 - Self-study SET 1 - Thematic Batch 3

Mother buys 16 doughnuts. Karol eats half of them, Eva eats two, and Dona eats the rest. How many doughnuts does Dona eat?

Robert uses small cubes to build the pipe shown on the left. Later, he uses those cubes to build the tower shown on the right.
How many cubes from the pipe are left over after he finishes the tower?

The figures below have 8, 21 and 40 white squares, respectively.
How many white squares are in the next figure?

A flea can jump up either 1 stair or 2 stairs at a time.
In how many ways can it jump from the floor to the fifth stair?
Diagram labels: “Sàn nhà” means floor; “Bậc” means stair.

Geoff goes to the cinema with his father. They sit in seats 71 and 72. The sign below gives directions to the seats.
Which arrow should Geoff and his father follow?
The five rows of the sign direct seats 1–20, 21–40, 41–60, 61–80 and 81–100, from top to bottom.

A grocery shop sells cartons of 6 eggs and cartons of 12 eggs. What is the smallest number of cartons needed to buy exactly 66 eggs?

Beatrice has a square chocolate bar. After eating some of its pieces, the part shown below remains.
What is the smallest number of chocolate pieces she has eaten?

Roro writes some numbers using only the digits 0 and 1. Their sum is 2013. It is impossible to write fewer such numbers with the same sum. How many numbers does Roro write?

Lenka pays 1 unit and 50 cents for three ice-cream cones. Miso pays 2 units and 40 cents for two sandwiches. How much must Igor pay for one ice-cream cone and one sandwich?

Susan is 6 years old this year. Her younger sister is 1 year younger than she is, and her older brother is 1 year older. What is the sum of their three ages?

One year before Masha was born, her parents’ ages totalled 40. Two years from now, the total age of Masha and both parents will be 90. How old is Masha this year?

Anna folds the piece of paper shown below to make a house.
Which house below could she make?

Linda the dressmaker loves collecting rare objects. She visits an unusual forest and meets indigenous girls. They like the dresses, shoes and jewellery she has brought, so they exchange rare forest objects for her dresses, shoes and jewellery as shown.
Which collection below can be exchanged for all four items: a dress, shoes, a necklace and a hair clip?

There are 35 ladybirds and caterpillars on a tree. The number of ladybirds is 3/4 of the number of caterpillars. After a while, some caterpillars become butterflies and fly away. The number of caterpillars left is now 2/5 of the number of ladybirds. How many caterpillars have become butterflies?

On Sunday afternoon, the neighbourhood girls play shop. They make paper money for buying and selling. Mai has ingredients but no pot, so she rents Ngọc’s pot. Ngọc charges Mai 1 unit for each minute. Mai starts renting at 3:10 p.m. and returns the pot at twenty-five minutes to four in the afternoon. Mai gives Ngọc three notes, each worth 10 units. How much change should Ngọc give Mai?

Which number can replace the question mark so that all the calculations are correct?

Which calculation below does not have the same result as 671 − 389?

Using the diagram, how many metres long is the train?

Theresa has 37 CDs. If she gives Claudia 10 CDs, they will have equal numbers. How many CDs does Claudia have now?

Dennis has a piece of card made of five unit squares as shown.
How many of the shapes below can he obtain by cutting off one unit square from the original shape?