PIMSO 2021 - Mathematics - Grade 2 - National Round

Find R in $R-49=27$.

Find the value of $3+3-3+3-3+3-3+3-3+3-3+3-3$.

What is the result of the operations below?

$100-48-27-19-6$.

Find A in the multiplication sentence below.

$A\times1+A\times2+A\times3=42$

Find the number M if $M+M+88=40+(10\times M)$.

How many odd numbers are covered by the log in the series of numbers below?

Cards A, B, C, and D have numbers 27, 30, 97, and 121 on it.
Card A has an even number
Card B has a number that can only be divided by only two numbers
Card D is the result when 3 is multiplied three times to itself

What is the number written on Card C?

What is A in $AB\times5=B15$?

Antonio pressed the switch 15 times when it was on at first. His brother pressed the same switch 18 times after Antonio left. Is the switch on or off now?

There is a long line of students in the canteen during the break. Juan is exactly between Pedro and Lando. There are 13 students in front of Pedro and Juan is the 24th from the last. How many students are in the line during that time?

Four pigeons participated in Asia Pigeon Race 2020. Below is their conversation after the race.
Speedy: I was faster than Flash.
Dash: I beat Bolt in the race but I was slower than Speedy.
Flash: Dash can’t win over me.
Who is the champion in the race?

Study the number sentence below.

What does the letter E represent?

What is the sum of the 8th and 9th term in the number pattern below?

2, 5, 10, 17, 26, 37, 50, …

Rika’s mother is 52 years old. If Rika is 16 years old now, how many years ago was her mother five times as old as she?

How many holes are covered by the triangle on the piece of biscuit cracker below?

How many triangles are formed by the 5 dots below?

How many lines of symmetry does the given figure have?

What is the most number of pieces that can be made when you cut the watermelon thrice?

Observe the pattern below. The side of each square is 1 cm. How many such squares are there in Figure 5?