VTMO 2015 — Grade 3 — semifinal

Question 1

Find the sum of the thousands digit and tens digit of $6987$.

$9$
$10$
$13$
$14$
$15$

Question 2

An wakes late and reaches the bus stop at $9 : 05$, fifteen minutes after departure. When did the bus leave?

$8 : 45$
$8 : 50$
$8 : 55$
$9 : 15$
$9 : 20$

Question 3

Which expression has the greatest value?

$4\times3+2+1$
$4+3+2+1$
$4+3\times2+1$
$4\times3+2\times1$
$4+3+2\times1$

Question 4

An’s birthday is on Wednesday. Binh’s birthday is $17$ days later. On which weekday is Binh’s birthday?

Wednesday
Thursday
Friday
Saturday
Sunday

Question 5

Which number cannot be the remainder when a natural number is divided by $9$?

Question 6

Ti writes the natural numbers from $4$ through $34$ on the board: $4 , 5 , 6 , \ldots , 32 , 33 , 34$. How many numbers does he write?

$28$
$29$
$30$
$31$
$32$

Question 7

Given $8\circledast5=8\times5+8+5=53$, evaluate $9\circledast3$.

$36$
$39$
$42$
$45$
$48$

Question 8

Pi uses six squares of side $1 \,\mathrm{cm}$ to form the figure below. What is its perimeter?

Question illustration

$9$
$10$
$11$
$12$
$13$

Question 9

How many cubes are in the solid below, including concealed cubes?

Question illustration

$7$
$8$
$9$
$10$
$12$

Question 10

The difference of two numbers is $76$. If $12$ is added to the minuend and the subtrahend stays unchanged, what is the new difference?

$12$
$64$
$67$
$76$
$88$

Question 11

Find the difference between $2015\times1001$ and $2013\times1001$.

$2$
$2013$
$2015$
$1002$
$2002$

Question 12

Minh takes three tests, receiving an odd score on each. Which number could be the total of his three scores?

$18$
$19$
$20$
$22$
$30$

Question 13

Pi writes the natural numbers $1$ through $40$. How many are divisible by $2$ but not by $5$?

$4$
$14$
$15$
$16$
$20$

Question 14

The scale below is balanced. How many circles have the same weight as one rectangle?

Question illustration

Question 15

Thanh cuts a piece of wood into $10$ equal parts. Each cut takes one minute. What is the least time required?

$5$ phút
$9$ phút
$10$ phút
$11$ phút
$12$ phút

Question 16

How many faces does the solid below have?

Question illustration

$6$
$8$
$9$
$10$
$12$

Question 17

Thanh has $22$ marbles and forms the figures following the pattern below. What is the largest figure number he can make?

Question illustration

Figure $4$
Figure $5$
Figure $6$
Figure $7$
Figure $8$

Question 18

An’s clock started malfunctioning three hours ago. It loses seven minutes every hour. It now shows $2 : 45$. What is the correct time?

$2 : 24$
$2 : 38$
$2 : 53$
$2 : 59$
$3 : 06$

Forty-four passengers need to cross a river. A large boat holds six passengers and a small boat four per trip. How many combinations of full boatloads can carry all $44$ passengers, with no empty seats?

Question 20

After buying two notebooks, Pi would have $5000$ dong left. Buying three notebooks would leave him $7000$ dong short. What is the price of one notebook?

$7000$
$10000$
$12000$
$14000$
$15000$