Riddles
You are running a race and you pass the participant that goes second, what place are you now?
second
78 : 2
39
In a menu, there are 2 main dishes and 4 desserts. How many different combinations can you have?
8
What is heavier, a kg of feathers or a kg of rocks?
they weigh the same (same mass)
54 divided by 4
13.5
Sharon is Juan’s daughter. That means that Juan is the ____________ of Sharon’s father.
name
314
A rectangle is 18 m long. If its perimeter (total distance around) is 50. What is the width of the rectangle?
7 m
Using the digits 1, 2, and 3 once to make as many different 3-digit numbers as possible.
6 different numbers: 123, 132, 213, 231, 312, 321
What is the half of the half of the half of 10?
1.25
What needs to be broken before being used?
egg
72 x 5
360
A snail fell on a well that is 10 bricks deep. Every day he climbs 4 bricks but falls 2 while sleeping. How many days will it take for him to get out?
4 days
Use the digits 1 to 9 to make 3 2-digit numbers so the second one is twice the first one and the third number is three times the first one.
18 – 36 – 54 / 19 – 38 – 57 / 27 – 54 – 81 / 16 – 32 – 48
What is the product of 2.3 and 0.47?
1.081
What isn't yet, but has to be...and when it happens, it won't longer exist.
tomorrow / future
37 x 7
259
The perimeter (distance around) of a square is 28.6 m.
If you doubled the length of each side, what would the new perimeter be?
57.2 m
Divide a square into 8 parts, using only 3 lines.
use 2 straight lines and a circle in the centre. There are 8 parts, but not equal.
Find a quarter of the product of 5.1 and 7
8.925
The Smiths have 6 daughters. If each daughter has a brother. How many siblings are they altogether?
7
78 x 8
624
Can you get the sum of all whole numbers from 0 to 100 without a calculator? Find a strategy!
5050
(form 50 pairs: 0 and 100, 1 and 99, etc). 50 has no pair.
50x100 = 5000 + 50 = 5050
Use 3 2-digit numbers to add up to 100. you cannot repeat any digit.
answers vary
17 + 35 + 48 is an example
What is the double of the quotient of 214 and 8?
53.5