Đ ề thi TIMO Vòng Qu ố c Gia 2025 - 2026 K h ố i 5 Ms Huy ề n: 0965.865.940 6 - digit number: S ố có 6 ch ữ s ố Divisible: Chia h ế t cho; Maximum value: Giá tr ị l ớ n nh ấ t Câu 15. How many 4 - digit numbers divisible by 12 or divisible by 15 are there? 4 - digit numbers: S ố có 4 ch ữ s ố Divisible by: Chia h ế t cho Câu 16. How many rectangles are there in the figure below? Rectangle: Hình ch ữ nh ậ t Figure: Hình v ẽ Câu 17. Given a regular hexagon. The measurement of its interior angle is 荝 ∘ . The measurement of its exterior angle is 荞 ∘ . Find the difference of 荝 and 荞 . Regular hexagon: Hình l ụ c giác đ ề u Measurement: S ố đo Interior angle: Góc trong Exterior angle: Góc ngoài Difference: Hi ệ u Câu 18. The area of parallelogram ABCD in the figure below is 180 cm². 荟荡 is perpendicular to 荝荠 and the length of 荟荡 is 10 cm. Given that the area of the white region is 5 times the area of the shaded region, find the length of 荝荡 in cm. Area: Di ệ n tích; Parallelogram: Hình bình hành; Figure: Hình v ẽ ; Perpendicular: Vuông góc; Shaded region: Ph ầ n tô đ ậ m ; Length: Đ ộ dài; 5 times: G ấ p 5 l ầ n Đ ề thi TIMO Vòng Qu ố c Gia 2025 - 2026 K h ố i 5 Ms Huy ề n: 0965.865.940 Câu 19. Given that the perimeter of a rectangle is 100, and the side lengths of the rectang le are integers, what is the largest possible area of the rectangle? Perimeter: Chu vi; Rectangle: Hình ch ữ nh ậ t; Side length: Đ ộ dài c ạ nh; Integer: S ố nguyên; Largest: L ớ n nh ấ t; Area: Di ệ n tích Câu 20. 15 cubes are glued face - to - face to form the solid below. Given that each cube has a side length of 1 cm, find the total surface area of the solid in cm². Cube: Kh ố i l ậ p phương; Glue face - to - face: Dán các m ặ t v ớ i nhau; Solid: Kh ố i hình Side length: Đ ộ dài c ạ nh; Total surface area: Di ệ n tích toàn ph ầ n Câu 21. Choose 3 digits from 0, 1, 2, 4, 6, 7, 9 to form 3 - digit numbers. How many odd numbers can be formed? (The repetition of digits is not allowed) Digit: Ch ữ
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