Skip to content / Đến nội dung
ThichHocToan.com

AMO 2025 – Primary 6 (Grade 6)

Question 1

Two circles are drawn in the coordinate plane. The small circle has centre C and radius 1 inch; the large circle has centre O and radius 2 inches. Find the ratio of the shaded area to the area of the small circle.

Question illustration
  1. 6:1
  2. 4:1
  3. 3:1
  4. 2:1

Question 2

Evaluate $\dfrac{2026^2-2025^2}{8102}\times120$.

Question illustration
  1. 100
  2. 80
  3. 60
  4. 51

Question 3

Celsius and Fahrenheit temperatures satisfy $C=\frac59(F-32)$. What Fahrenheit temperature corresponds to the normal body temperature $37^\circ C$?

Question illustration
  1. $99.5^\circ F$
  2. $98.6^\circ F$
  3. $96.8^\circ F$
  4. $95.8^\circ F$

Question 4

A sheet of paper is about 0.2 mm thick. If it could be folded in half repeatedly, how many folds would make its thickness at least 1 metre?

Question illustration
  1. 16
  2. 15
  3. 14
  4. 13

Question 5

In right triangle ABC, right-angled at C, $BC=\frac12AB$. D is the midpoint of AB, and $DE\perp AC$ at E. If BC=10 cm, find the perimeter of triangle BCD.

Question illustration
  1. 45 cm
  2. 30 cm
  3. 25 cm
  4. 24 cm

Question 6

The complete data set is shown in the stem-and-leaf plot. What is the absolute difference between its mean and median? The key 3|1 means 31.

Question illustration
  1. 3.2
  2. 2.4
  3. 1.4
  4. 1.2

Question 7

A rectangular floor is divided into four rectangles as shown. Three areas are given in square feet. Find the missing area.

Question illustration
  1. 1024
  2. 960
  3. 868
  4. 780

Question 8

Tickets are sold in small bundles of 3 and large bundles of 5. Jack wants exactly 17 tickets, without loose tickets or leftovers. How many bundles in total should he buy?

Question illustration
  1. 6
  2. 5
  3. 4
  4. 3

Question 9

Which number does not satisfy $|2x-1|<15$?

Question illustration
  1. $-5$
  2. 0
  3. 6
  4. 9