VTMO 2013 — Grade 4 — semifinal

Which number can replace the cloud symbol so that $a\times a=2\times2\times3\times3$ is true?

An’s class starts a $45$-minute mathematics test at $8 : 30$. At what time do they submit it?

Which symbol replaces the box in $1+1\square1-2=100$? The two digits $1$ on either side are written together with the chosen symbol.

Hoang lives with his father, mother, younger sister, $a$ dog, $a$ cat, two parrots and four fish. How many legs are there in the household?

Which of these numbers is divisible by $9$?

What fraction of the square’s area is shaded?

How many odd numbers are there from $3$ to $99$ inclusive?

Find the perimeter of the figure below, using the marked dimensions.

What is the area of the shaded figure below?

A motorcyclist travels $28 \,\mathrm{km}$ in $30$ minutes at constant speed. What is the speed in km per hour?

An older sister is $15$. Three years ago she was twice as old as her younger sibling. How old is the younger sibling now?

An, Binh and Chi’s ages currently sum to $30$. What will their combined age be in two years?

Pi colors $TITAN$ EDUCATION: identical letters have the same color and different letters have different colors. How many colors are required?

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

An $L$-shaped tile consists of $4$ unit squares as shown. How many of the five shapes below can be formed from two such $L$ tiles?

An aircraft has rows numbered $1$ to $25$, except row $13$ is absent. Row $15$ has $4$ seats; every other row has $6$. How many seats are there?

There are $60$ seats around a circular table. Pupils sit so that each pupil has exactly one occupied neighboring seat. What is the maximum number of pupils?

Five boxes contain letters $A , B , O , R , V$ as shown. Remove letters until each box contains one and the five remaining letters are distinct. Which letter remains in box $5$?

A village never uses numbers containing digit $3$. Houses on the right side are numbered with increasing odd numbers, starting $1 , 5 , \ldots$ . What is the number of the $15$ th house?

The first Saturday of a month is the $5$ th. What day of the week is the $25$ th?