Category 1: Math Riddles
If you multiply me by any other number, the answer will always remain the same. What number am I?
0 (Anything times zero is zero!).
Why did the student eat their math homework?
Because the teacher told them it was a piece of cake!
How many years are in a single century?
100 years.
If you have 4 quarters, how many whole dollars do you have?
1 dollar ( 4/4 = 1 )
What do you call a polygon with 4 equal sides and 4 right angles?
A square.
I am a three-digit number. My tens digit is 5, my hundreds digit is less than 2, and my ones digit is the number of sides on a triangle. What number am I?
153
Why did the teacher wear sunglasses to school last week?
Because the 5th graders were all so bright!
How many items are in a "baker's dozen"?
13 (A regular dozen is 12!).
Which is larger: 0.5 or 0.05?
0.5 (Five tenths is much bigger than five hundredths!).
To find the perimeter of a shape, do you add the sides together or multiply them?
Add them together.
A farmer has 17 sheep. All but 9 of them run away. How many sheep does the farmer have left?
9 ("All but 9" means 9 stayed!).
What is a math teacher's favorite tree?
A Geome-tree!
How many states are there in the United States of America?
50
If you eat 3/8 of a pizza, how many slices are left for your friends?
5 slices or 5/8 of pizza
If a rectangle has a length of 5 cm and a width of 4 cm, what is its total area?
20 square cm ( 5 x 4 )
What can you catch but not throw?
A cold (or a breath).
Why was the equal sign ($=$) so humble?
Because it knew it wasn't greater than or less than anyone else!
What is the only number that cannot be represented by Roman numerals?
Zero (The Romans didn't have a letter for nothing!).
Convert the fraction 1/2 into a decimal
0.5
What do you call an angle that forms a perfect corner and measures exactly 90 degrees?
A right angle
If a doctor gives you 3 pills and tells you to take one every half hour, how long will the pills last?
1 hour (You take the first one right away, the second 30 minutes later, and the third 30 minutes after that).
Why did the two 4s skip lunch?
Because they already 8 (ate)! ( 4 + 4 = 8 )
On a standard pair of dice, what do the opposite sides always add up to?
7 (1 is opposite 6, 2 is opposite 5, 3 is opposite 4).
What is 1/2 of 1/4 ? (Think of cutting a quarter of a cake in half!).
1/8
What do you call two flat lines that run side-by-side like train tracks and will never, ever cross or touch?
Parallel lines