Skip to content / Đến nội dung
ThichHocToan.com

SEAMO 2026 — Paper B — Organizer self-practice SET 2

Question 1

Find the next number in the sequence:

$5611,111223,232447,\ldots$
  1. 232495
  2. 464793
  3. 474895
  4. 474896
  5. None of the above

Question 2

Find the perimeter of the figure, in cm.

Question illustration
  1. 38
  2. 42
  3. 44
  4. 46
  5. None of the above

Question 3

6 footballs and 3 basketballs cost 279 dollars. 2 footballs and 3 basketballs cost 139 dollars. Find the prices of a football and a basketball, respectively.
  1. 35 and 21 dollars
  2. 35 and 23 dollars
  3. 40 and 21 dollars
  4. 40 and 23 dollars
  5. None of the above

Question 4

How many unit cubes are in the solid stack shown? There are no gaps underneath the visible cubes.

Question illustration
  1. 20
  2. 22
  3. 23
  4. 24
  5. None of the above

Question 5

In the additions below, each letter represents a different digit. Find the four-digit number $\overline{ABCD}$.

$$\begin{array}{rrrrr}&A&B&C&D\\+&&E&F&G\\\hline&9&0&6&3\end{array}\qquad\begin{array}{rrrrr}&&A&B&C\\+&D&E&F&G\\\hline&2&5&2&9\end{array}$$
  1. 8370
  2. 9464
  3. 8371
  4. 9465
  5. 8372

Question 6

Pine trees are planted at equal intervals of 16 m along a straight road, including both ends of the road. If the road is 960 m long, how many pine trees are there altogether?
  1. 56
  2. 58
  3. 59
  4. 60
  5. None of the above

Question 7

Place the numbers 1 to 9, each used once, in the circles. The centre is 5. The numbers on each of the two straight lines have the same sum $S$. Find $S$.

Question illustration
  1. 25
  2. 26
  3. 22
  4. 34
  5. None of the above

Question 8

There are 14 children at a party. If each child shakes hands with every other child exactly once, how many handshakes take place?
  1. 75
  2. 85
  3. 87
  4. 89
  5. None of the above

Question 9

When 925 is divided by $m$, the quotient is 35 and the remainder is 15. Find $m$.
  1. 23
  2. 25
  3. 26
  4. 27
  5. None of the above

Question 10

A bag contains 15 red, 20 white, 25 black and 40 yellow balls. Without looking, balls are removed without replacement. What is the least number that must be removed to guarantee at least one ball of each of the four colours?
  1. 86
  2. 76
  3. 75
  4. 66
  5. None of the above

Question 11

Find the missing number in the number puzzle. The same rule is used in all three groups.

Question illustration
  1. 5
  2. 7
  3. 4
  4. 8
  5. None of the above

Question 12

Peter has 100 chickens and rabbits altogether on his farm. They have 260 legs in total. How many chickens are there?
  1. 40
  2. 50
  3. 60
  4. 70
  5. None of the above

Question 13

Teacher Ali has a bag of sweets. If he gives each student 4 sweets, 4 sweets remain. If he gives each student 5 sweets, he is short of 7 sweets. How many sweets does he have?
  1. 45
  2. 46
  3. 47
  4. 48
  5. None of the above

Question 14

A mathematics test has 15 questions. Each correct answer earns 8 marks and each wrong answer loses 4 marks. John answers all 15 questions and scores 72 marks. How many answers are wrong?
  1. 2
  2. 3
  3. 4
  4. 5
  5. None of the above

Question 15

Cindy's father is four times as old as Cindy. Three years ago, their ages added up to 49. How old are Cindy and her father, respectively, this year?
  1. 10 and 45
  2. 11 and 44
  3. 12 and 46
  4. 9 and 36
  5. None of the above

Question 16

Mark had some stamps. He gave Shaun 10 fewer than half of his stamps. Then he gave Cindy 6 more than half of the remainder. Finally, he gave his cousin 30 stamps and had 40 left. How many stamps did he have at first?
  1. 284
  2. 304
  3. 322
  4. 354
  5. None of the above

Question 17

The rectangle shown has length 36 cm. It contains two shaded squares and 7 identical small rectangles. Find the area of one small rectangle, in square cm.

Question illustration
  1. 98
  2. 120
  3. 144
  4. 156
  5. None of the above

Question 18

Train A leaves Town X for Town Y at 60 km/h. One hour later, Train B leaves Town X for Town Y at 75 km/h. Both continue at these speeds until Train B catches Train A. How long does Train B take to catch Train A?
  1. 2 h 30 min
  2. 3 h
  3. 3 h 30 min
  4. 3 h 45 min
  5. None of the above

Question 19

The top row of the arrangement has 60 circles. Each row below has one fewer circle, down to a single circle. How many circles are there altogether?

Question illustration
  1. 1750
  2. 1780
  3. 1830
  4. 1880
  5. None of the above

Question 20

The diagram shows square $ABCD$ of side 10 cm and a shaded rectangle of area 6 square cm. The interior horizontal and vertical segments are parallel to the sides of the square. Find the area of quadrilateral $EFGH$.

Question illustration
  1. $49\text{ cm}^2$
  2. $51\text{ cm}^2$
  3. $62\text{ cm}^2$
  4. $53\text{ cm}^2$
  5. $56\text{ cm}^2$