Brain Teaser

You have 2 matchsticks.

Without breaking them, how can you make them into a square?

• You can't

• By overlapping them

• By using a mirror

• By folding them

Answer explanation

Place one matchstick against a mirror — the reflection creates the illusion of a square.

I am a number.

Multiply me by 4 and you get the same as adding 30 to me.

What number am I?

• 10

• 15

• 20

• 30

Answer explanation

Let x be the number.
4x = x + 30 → 3x = 30 → x = 10

What comes next in the sequence: 2, 3, 5, 8, 12, ___?

• 16

• 17

• 18

• 20

Answer explanation

Pattern adds 1, 2, 3, 4...
2 → +1 → 3 → +2 → 5 → +3 → 8 → +4 → 12 → +5 → 17

Which shape always has four equal sides and four right angles?

• Rectangle

• Rhombus

• Square

• Parallelogram

Answer explanation

Only a square has both equal sides and right angles.

I am an odd number.

Take away one letter, and I become even.

What number am I?

• Seven

• Eleven

• Nine

• Five

Answer explanation

The word "seven" is an odd number.
If you remove the letter ‘s’, you get the word "even" — which is the opposite of odd.
It’s a wordplay riddle, not a math calculation!

What do we breathe in to stay alive?

• Hydrogen

• Oxygen

• Carbon

• Helium

Answer explanation

Oxygen is the gas our bodies need to survive. We breathe it in from the air around us.

Which element is used in balloons to make them float?

• Oxygen

• Nitrogen

• Helium

• Hydrogen

Answer explanation

Helium is lighter than air and non-flammable, unlike hydrogen.

What part of the human body can detect thousands of smells?

• Tongue

• Brain

• Lungs

• Nose

Answer explanation

The olfactory bulb in the nose detects over 10,000 distinct scents.

Which organ pumps blood around your body?

• Brain

• Lungs

• Heart

• Kidney

Answer explanation

The heart is a muscular organ that beats continuously to pump blood and oxygen throughout your body.

Which of these is NOT a planet?

• Mars

• Earth

• Sun

• Venus

Answer explanation

The Sun is a star, not a planet. Mars, Earth, and Venus are all planets in our solar system.