In a certain classroom, 75% of the students can speak English, 55% of the students can speak French, and 10% speak neither language.
What percentage of the students speak both languages?
Continue reading “Speak Both Languages”
Tag Simple Math
Puzzles and brain teasers involving basic arithmetic and other simple math concepts – very little math knowledge required!
7 Matchstick Equation Puzzles
In matchstick puzzles, you are presented with an incorrect equation made using matchsticks, and you must move 1 or more matchsticks to turn it into a valid equation.
You must use all of the matches, and you are not allowed to make an inequality symbol such as ≠, ≥, >, <, or ≤.
In each of these 7 fun matchstick equation puzzles, move exactly 1 match to fix the equation:
Click for Solution to 1 + 2 = 8
7 + 2 = 9
Matchstick Equation 4
Move exactly 2 matches to make this a valid equation.
Bonus: find two different solutions.
In matchstick equation puzzles, you are not allowed to make an inequality symbol such as ≠, ≥, >, <, or ≤. That would make it too easy!
Continue reading “Matchstick Equation 4”Most Frequent Digit
What is the most frequent digit among the numbers between 1 and 1000 (inclusive)? Consider only base-10 whole numbers.
Continue reading “Most Frequent Digit”Zero-less Factors
What two numbers contain no zeroes and can be multiplied together to produce 100000?
Continue reading “Zero-less Factors”How Many Friday the 13th in a Year
Some consider Friday the 13th (any Friday that falls on the 13th day of a month) unlucky.
In a calendar year, how many Friday the 13th can occur? Find both the minimum and maximum.
Continue reading “How Many Friday the 13th in a Year”Consecutive Numbers Grid Puzzle
| 13 | |||
| 10 | |||
| 4 | 16 | ||
| 7 |
The cells in this 4×4 grid puzzle contain the numbers 1-16 each once. There are two rules to the arrangement of the numbers:
- Any two consecutive numbers must share a row/column (1 and 16 should be considered consecutive).
- No row/column can contain three consecutive numbers.
Fill in the remaining numbers.
Continue reading “Consecutive Numbers Grid Puzzle”Matchstick Math 3
Rearrange exactly 2 matches to make this a valid equation.
In matchstick math puzzles, you are not allowed to make an inequality symbol such as ≠, ≥, >, <, or ≤. That would make it too easy!
Continue reading “Matchstick Math 3”I Like the Numbers 4 and 5
I like the numbers 4 and 5. I like to add 4’s and 5’s together to make other numbers, such as 4 + 4 + 5 + 5 + 5 = 23. How many numbers from 1 to 1000 can be written as the sum of 4’s and 5’s?
Continue reading “I Like the Numbers 4 and 5”Password to Exclusive Club
A man wants to enter an exclusive club, but doesn’t know the password. He observes a few other patrons:
- First patron walks up and the doorman just says “12”. The patron replies “6” and is let in.
- Second patron walks up and the doorman says “6”. The patron replies “3” and is let in.
Thinking he has figured it out, the man walks up and the doorman says “10”. The man replies “5” but it’s incorrect and he is turned away.
What should the man have said instead?
Continue reading “Password to Exclusive Club”