Grade 8 Fun — Brain Teasers

A sequence: 2, 6, 12, 20, 30, … What is the next number?

Rearrange the letters in LISTEN to form a word that means 'quiet.' What word?

If all Bloops are Razzies and some Razzies are Lazzies, which statement must be true? (A) All Bloops are Lazzies (B) Some Bloops may be Lazzies (C) No Bloops are Lazzies

A farmer has 17 sheep. All but 9 run away. How many sheep does the farmer have left?

Find the next letter: A, C, F, J, O, …

What 5-letter word becomes shorter when you add two letters to it?

Three switches outside a room control one light bulb inside (the other two do nothing). You may enter the room only once. How can you determine which switch controls the bulb? (Assume a bulb that gets warm when lit.)

A clock shows 3:15. What is the angle between the hour and minute hands?

I speak without a mouth and hear without ears. I have no body, but I come alive with wind. What am I?

Replace the question mark: 1, 11, 21, 1211, 111221, ?

Using each digit 1–9 exactly once, form three 3-digit numbers that sum to 1089. Give one valid example.

Which shape does not belong with the others: square, triangle, circle, rectangle? Explain.