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VTMO 2013 — Grade 3 — semifinal

Question 1

What number can replace each ♣ so that $♣\times♣=2\times2\times3\times3$?
  1. $2$
  2. $3$
  3. $4$
  4. $9$
  5. $6$

Question 3

A number is divided by $3$, then multiplied by $4$, giving $24$. What is the number?
  1. $18$
  2. $12$
  3. $6$
  4. $24$
  5. $20$

Question 4

In $33543$, what do the digits $3$ represent, from left to right?
  1. $3$ thousands, $3$ hundreds, $3$ units.
  2. $3$ ten-thousands, $3$ thousands, $3$ tens.
  3. $3$ ten-thousands, $3$ hundreds, $3$ units.
  4. $3$ ten-thousands, $3$ thousands, $3$ units.
  5. $3$ units, $3$ thousands, $3$ ten-thousands.

Question 5

How does $85$ change if the digit $2$ is placed to its left?
  1. It increases by $200$.
  2. It increases by $20$.
  3. It becomes $20$ times as large.
  4. It increases by $767$.
  5. It decreases by $20$.

Question 6

Which two digits should be removed from $385697$ to obtain the greatest remaining four-digit number?
  1. $3$ and $8$
  2. $3$ and $5$
  3. $5$ and $6$
  4. $3$ and $6$
  5. $3$ and $7$

Question 7

An’s class has a $45$-minute mathematics test, starting at $8 : 30$. At what time do they submit their papers?
  1. $8 : 45$
  2. $9 : 00$
  3. $9 : 15$
  4. $9 : 25$
  5. $9 : 30$

Question 8

A square has perimeter $24 \,\mathrm{cm}$. Find its area.
  1. $84 \,\mathrm{cm}^{2}$
  2. $64 \,\mathrm{cm}^{2}$
  3. $36 \,\mathrm{cm}^{2}$
  4. $24 \,\mathrm{cm}^{2}$
  5. $144 \,\mathrm{cm}^{2}$

Question 9

What is the perimeter of the figure below?

Question illustration
  1. $12 \,\mathrm{cm}$
  2. $16 \,\mathrm{cm}$
  3. $18 \,\mathrm{cm}$
  4. $20 \,\mathrm{cm}$
  5. $22 \,\mathrm{cm}$

Question 10

Which of the following numbers is divisible by $9$?
  1. $2012$
  2. $2013$
  3. $2014$
  4. $2015$
  5. $2016$

Question 11

My sister is $15$ this year. Three years ago she was twice my age. How old $am$ I this year?
  1. $9$ tuổi
  2. $5$ tuổi
  3. $12$ tuổi
  4. $6$ tuổi
  5. $7$ tuổi

Question 12

Binh cuts a loaf of bread into $5$ pieces. How many cuts are needed?
  1. $3$
  2. $4$
  3. $5$
  4. $6$
  5. $2$

Question 13

How many odd numbers are there from $3$ to $99$ inclusive?
  1. $98$
  2. $51$
  3. $50$
  4. $49$
  5. $48$

Question 14

The total age of two brothers is $21$ this year. What will their total age be in three years?
  1. $23$ tuổi
  2. $24$ tuổi
  3. $25$ tuổi
  4. $26$ tuổi
  5. $27$ tuổi

Question 15

What is the greatest possible number of Sundays in a year?
  1. $37$
  2. $49$
  3. $52$
  4. $53$
  5. $64$

Question 16

Pi colors the letters in $TITAN$ EDUCATION. Different letters receive different colors, and identical letters receive the same color. How many colors are needed?
  1. $7$
  2. $8$
  3. $9$
  4. $10$
  5. $11$

Question 17

Five people eat five apples in five minutes. How long do twenty people take to eat twenty apples?
  1. $5$ phút
  2. $10$ phút
  3. $15$ phút
  4. $20$ phút
  5. $25$ phút

Question 18

A rectangular wall pattern uses gray tiles and striped tiles. Some tiles have fallen out, as shown. How many missing tiles are gray?

Question illustration
  1. $5$
  2. $6$
  3. $7$
  4. $8$
  5. $9$

Question 19

In a strange village no house number may contain the digit $3$. Houses on the right side of the road use odd numbers in increasing order: the first is $1$ and the second is $5$. What is the number of the fifteenth house on that side?
  1. $29$
  2. $41$
  3. $49$
  4. $45$
  5. $47$

Question 20

The first Saturday of a month is the $5$ th. What day of the week is the $25$ th?
  1. Tuesday
  2. Wednesday
  3. Thursday
  4. Friday
  5. Saturday