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Easy math riddles: Crazy 8s
Using only addition, add eight 8s to get the number 1,000.
888+88+8+8+8= 1,000
I add six to eleven, and get five. Why is this correct?
When it is 11 a.m.
•What is the formula for the area of a triangle?
•a= 1/2bh
You know 2 + 2 comes to the same as 2 x 2. Now find a set of three different whole numbers whose sum is equal to their total when multiplied.
1, 2, and 3
What is the formula for the volume of a rectangular prism?
v = L w h
•What is the volume of a rectangular prism with a length of 10cm, a width of 15cm, and height of 5cm?
v =750 cm cubed
•What is the formula for the area of a trapezoid?
•A=1/2 h(b1 + b2)
What single digit appears most frequently between and including the numbers 1 and 1,000? Hint: look for a pattern!
The most common digit is 1!
Did you figure out why? Every number 1-9 appears exactly the same number of times in every ten numbers. But because we included the number 1,000, there’s an extra occurrence of the number 1. In total, the number 1 appears 301 times, and every other number appears 300 times.
BRAIN TEASER
8 = 56
7 = 42
6 = 30
5= 20
3 =?
6
BRAIN TEASER
X +X=60
Y+ Y = 20
Z+Z= 4
X + Y:Z =?
35
What is the next number in the pattern? 2, 3, 5, 7, ____
•A. 9
•B. 10
•C. 11
• D. 12
•C. 11
50% of 20
10
On Bert's 14th Birthday, his younger brother Chip was half his age.
If today is Bert's 31st Birthday, how old is Chip?
Chip is 24 years old!
(Bert is 7 years older than Chip)
The new temperature if
the temperature was 5 o
and dropped 8 o
What is
- 3 o
30 - 5 x 2 x 3
What is
0
Brain Teaser
10÷5+3×2-3= ?
5
Brain teaser
1+3=34
5+2=27
2+4=?
46
What can you put between a 7 and an 8 so that
the result is GREATER THAN 7, but LESS THAN 8?
A Decimal point!
7 < 7.8 < 8
How many times can you
subtract 1O from 50?
Only once, because after you subtract
it's not 50 anymore.
A chicken was given 1O$.
A spider was given 40$.
An ant was given 30$.
How much would a dog get?
Hint: part of the body
The dog will get 20$. five dollars for each leg.
You have 2 cows,
2 birds,
and 1 cat.
How many legs do you have?
Two legs
A farmer has 17 sheep and all but
9 die.
How many are left alive?
9