BBB 2022 - Grade 4 - Preliminary Round

Find the value of $2021\div43$.

Find the smallest 3-digit number divisible by 12 and 16.

A square has perimeter 36 cm. Find its area in $\mathrm{cm}^2$.

Given an arithmetic sequence: 6,13,20,27,…,293,300. How many numbers are there?

Find the average of these numbers: 10,13,16,19,22,25,28.

Find the value of $697\div123+891\div123-112\div123$.

The difference between A and B is 72. A is 9 times of B. Find the value of A.

Refer to the figure below, how many triangles are there?

Find the value of $10-17+22-15+20-13+18-11+16+30$.

Given a rectangle with perimeter 28 cm. When its width is increased by 4 cm, its area is increased by $32\mathrm{cm}^2$. Find the original width of the rectangle.

Becky has 25 coins, including \$2 coins and \$5 coins worth \$83 in total. How many \$5 coins does she have?

It is December this month. Which month of the year was it 200 months ago?

If $2\otimes 2=2\times 4$ and $3\otimes 4=4\times 7\times 10$. Find the value of $2\otimes 9$.

In an English exam, the average marks for boys and girls are 60 and 90 respectively. The numbers of boys and girls are 14 and 16 respectively. What is the average mark of all students in the class?

If a 7-digit number $\overline{13436 A 0}$ is divisible by 18, find the value of A.

How many 3-digit numbers divisible by 4 are there?

Refer to the following figure, how many rectangles are there with 2 black stars?

The sum of ages of father and mother is 79 this year. If father’s age 8 years ago is equal to mother’s age 3 years ago, how old is father this year?

Anna builds 2 figures below by stacking identical cubes. If it takes 3 liters of paint to cover the surface of the figure on the left, at least how many liters of paint would it take to cover the surface of the figure on the right?

Numbers are drawn from 60 integers 1 to 60. At least how many numbers are drawn at random to ensure that there are two numbers whose sum is 77?