BBB 2021 - Grade 3 - Preliminary Round

Find the value of $36-44+49-30+45-70+44+33-27+50+12-55+47$.

Find the value of $6948+1829-779$.

Find the value of $318\times8$.

Yan and Fan have 75 eggs altogether. If the number of Fan’s eggs is 23 more than that of Yan’s, how many egg(s) does Fan have?

How many natural numbers are there from 13 to 149? (Including both end numbers)

A 2-digit number is divided by 7 to get a remainder of 4. Find the maximum value of this 2-digit number.

Find the value of $76+35+81+75+21+44$.

The age of Nick 5 years ago was equal to the age of Lee 4 years ago. Given Lee is 21 years old now, how old is Nick now?

Define the operation symbol $a\otimes b=a\times(a-b)$, find the value of $7\otimes5$.

To process 240 components, it requires 6 workers to finish within 8 days. Now the coordinators need to finish the job earlier. They add 4 workers to help. How many days are required to finish this set of components?

Today is Saturday. Which day of the week will 85 days later be?

Find the value of $5+10+15+\cdots+40+45+40+\cdots+15+10+5$.

Find the value of $6\times6\times5\times35\div100$.

There are a total of 21 chickens and rabbits in a farm. The animals have a total of 62 legs. How many rabbits are there?

Ming is now calculating his age this year. His age minuses 5, multiplies 13, adds 13 and is divided by 9 and the answer equal to his age. How old is Ming?

The sum of $A$ and $B$ is 144. $A$ is 11 times of $B$. Find the value of $B$.

It requires 20 minutes to cut a piece of wood into 5 sections. If the time required to cut into each section is the same, how many minutes are required to cut into 9 sections?

Refer to the figure below, how many line segments are there?

What is the smallest 3-digit number that can be divisible by 4 and 9?

Refer to the following figure, how many rectangle(s) is / are there with black dot?