VTMO 2026 - Grade 3 - Semifinal - SET 10 - Self-study

Minh has 5,000 dong left if he buys 3 notebooks, but is 19,000 dong short if he buys 5 notebooks. How much does one notebook cost, in dong?

Mother has 6 identical cakes. What is the smallest number of equal pieces into which she must cut each cake so that all the cake can be shared equally among 8 children?

A mother is 30 years older than her child. The child is 12 this year. What will their combined age be six years from now?

A number is divided by 3 and then multiplied by 4, giving 24. What is the original number?

Shortening one dimension of a square by 8 cm produces a rectangle whose area is 112 square centimetres less than the square’s. What is the perimeter of the original square, in centimetres?

The first Saturday of a month is the 5th. What day of the week is the 25th of that month?

Different letters represent different digits in the addition shown. N is even. What digit does M represent?

Hai thinks of three different two-digit natural numbers. Each is divisible by 2, 3 and 5. What is their sum?

Which of cards A–E is the mirror image of the original card? The original card is shown first; the choices appear below.

Tí writes all the two-digit numbers that contain the digit 3. How many numbers does he write?

Rabbit needs to saw one long log into 6 smaller pieces to build a house. How many cuts are needed?

The solid shown is a cube. Which of the five sheets A–E cannot be folded into a cube?

What number should replace the question mark in the circle?

Two ducks and three cats together weigh the same as six cats. Two ducks and six cats together weigh the same as how many cats?

How tall is Vy?

Class 3A has 28 students. Some students are absent during a survey about football and basketball. Every student surveyed likes at least one of the two sports: 10 like basketball, 20 like football and 4 like both. How many students are absent?

Which expression has the greatest value?

Tiến and Sơn start with the same amount of money. Tiến buys 3 pencils and 4 notebooks and has 7 dollars left. Sơn buys 3 pencils and 3 notebooks and has 28 dollars left. How many dollars does one notebook cost?

A teacher buys notebooks as gifts for students. Each gift contains 15 notebooks. She makes 12 gifts and has 10 notebooks left. How many notebooks did she buy altogether?

At a birthday party, An, Bình, Châu and Dũng wear shirts of four different colours: red, yellow, black and white. An does not wear red; Bình does not wear black. Either Bình or Dũng wears white. Châu wears yellow or white, and Dũng wears black or white. What colour does An wear? Enter the original code: 0001 for black, 0002 for white, or 0003 for yellow.