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AMO 2025 Primary 4 (Grade 4)

Question 1

A regular hexagon has six equal sides and six equal angles. Angela places a simple protractor as shown. What is the size of one interior angle?

Question illustration
  1. 30°
  2. 90°
  3. 120°
  4. 150°

Question 2

Four numbers satisfy $AB=24$, $BC=48$, and $CD=120$, as shown. Find $AD$.

Question illustration
  1. 40
  2. 60
  3. 64
  4. 124

Question 3

Identical small wooden blocks form the structures shown. The large cube is solid, with no empty space. How many small blocks are there altogether?

Question illustration
  1. 284
  2. 300
  3. 316
  4. 350

Question 4

Each of 120 students named one favourite class. The pie chart shows their answers. How many chose History? The chart labels mean Language Arts, Math, History, Music and Other.

Question illustration
  1. 8
  2. 18
  3. 36
  4. 40

Question 5

Square $ABCD$ measures 6 inches by 6 inches. The marked points $E,F,G,H$ are the midpoints of its sides. Find the area of shaded square $EFGH$ in square inches.

Question illustration
  1. 8
  2. 12
  3. 18
  4. 24

Question 6

Nina inputs 28 into this number machine. Subtract 5 if the number is not less than 5. Keep the result if it is less than 5; otherwise repeat the previous step. What is the output?

Question illustration
  1. 8
  2. 5
  3. 3
  4. 1

Question 7

The sum of all positive factors of 66 equals $A\times A$. Which listed value is $A$?

Question illustration
  1. 7
  2. 9
  3. 11
  4. 12

Question 8

Marbles form the growing triangular patterns shown. If the pattern continues, how many marbles are in the ninth shape?

Question illustration
  1. 90
  2. 60
  3. 55
  4. 45

Question 9

Which number is smallest among $1.50,\frac58,\frac87,\frac65,\frac34$? Choose from the original options below.

Question illustration
  1. $\frac58$
  2. $\frac87$
  3. $\frac65$
  4. 1.50