Place the digits 1 through 9 in the empty boxes in a special way.
Find the one-digit number that is just like all the others.
How many times will Allison write the digit 3?
They say you cannot add apples and oranges. You do in this puzzle! Can you break the code?
Find the missing base numbers.
How many pairs of “magic” numbers exist?
When will the digits of a digital clock be in strictly increasing order? In strictly decreasing order?
Follow the pattern and determine the number of people who get on and off the train.
Find a way to sum a set of even integers.
How many darts will Seong-Chang need to throw to earn a specific number of points?
Arrange the numbers in a 4×4 grid under a certain condition.
How old are the twins and their younger brother?
Find numbers whose prime factors equal a certain sum.
How much money did Judy give Dave?
Find the counterfeit coin.
Determine the number of zeros at the end of a particular factorial.
How could you cook eggs for 15 minutes if you do not have a 15-minute timer?
Is today’s date a factor of this month?
Which numbers are divisible by all three of the smallest prime numbers?
How many pages did Alexis read?
Can you find a multiplication sentence using the digits 1, 2, 3, 4, 5, and 6 such that the product is closest to a certain number?
Find the numbers represented by each letter in the puzzle.
Determine how many boxes are empty.
When does the product of the month number times the day number equal the last two digits of the year?
Determine how much a pail and nails weigh.
Examine numbers with exactly five factors.
Write the largest multiple of 12 given certain restrictions.
How many children and adults attended a special matinee of a magic show?
How old are a mother and son?
Find the smallest integer for which an expression results in an integer.
Use the same whole number and the operations +, -, x, and ÷ to produce a certain number.
Find the four-digit number that fits the description.
What is the highest score below 100 that is impossible to score on a given dart board?
If you wrote a list of consecutive whole numbers, how many times would you write the digit 5?
Betty wrote a list of consecutive whole numbers starting with the number 1. If you know how many digits she used, can you determine the last number Betty wrote?
If you know the product of two adults’ ages, can you determine the age of the younger adult?
Determine the product of abc under certain restrictions.
In how many ways could Moe, Larry, and Curly share eight cookies?
Examine numbers whose factors are all even, except for the number 1.
Use the digits 1, 2, 3, 4, and 5 to make a number that fits the description.
How many four-digit palindromes exist?
If Roberto was born on his grandmother’s birthday, how old are Roberto and his grandmother now?
How many of each kind of coin does Keith have in his secret pocket?
Find a decimal number that meets certain requirements.
How many shells does Ken have in his shell collection?
Place the numbers in the diagram’s squares in a special way to create a magic square.
Annie shoots three arrows that all land inside rings of an archery target. What were her three scores?
Determine the number of votes a particular candidate could have received.
In how many ways can you make change for a dollar using certain coins?
At what time will two traffic lights turn red together?
Determine if Amelia won the panda.
What is the largest number of video games a customer can purchase?
Find the least positive whole number that is divisible by all the numbers in a particular set.
If three darts are thrown at a bulls-eye, what are the possible totals?
In a mathematics contest find out how many of your team’s answers were incorrect and how many problems were unanswered.
How many boxes are needed to fill an order for 1256 chocolates?
Determine when the Johnson triplets will go to sleep at the same time.
Express a given number as a power of 3.
Can you find a two-digit number that gives a particular sum when the original number and the number obtained by reversing its digits are added?
Determine the one’s digit of a large number.
Place the digits 1 through 9 in the circles in a very special way.
What are the last two digits of large power of 7?
What are the last two digits of a huge number?
Determine a number given its particular properties.
Write a given number as the difference of two squares.
Find a special number that can make other numbers into perfect squares.
Find particular factors that produce 1,000,000.
Using only a digit and the four basic operations (+, -, x, /), produce a set of numbers.
Find all the whole numbers that can replace the variable x in a given expression so that the expression has a particular value.
Do any numbers from a given set have a sum of 100?
Find possible values of a digit in an eight-digit number when you know one of its divisors.
Find the smallest positive integer when you know its divisors and remainders.
Given three of its twelve factors, what is the mystery number?
Find a sequence of calculator key presses that produces a given number in the display.
Determine my age given that it is a multiple of a particular integer one year and a multiple of a different integer the next year.
Find three special numbers that add up to 365.
Find consecutive numbers whose product is a particular number.
Find a number with these special properties.
Determine how many times the digits of each number less than 209 add to 8.
Help Jasmine determine how many CDs, tapes, and videos she can buy.
Find numbers that are either squares or cubes.
Help Fran remember how much money she loaned each friend.
Can you produce exactly 3 gallons of water?
How much does a man make or lose in the horse-trading business?
What happened to the other dollar?
Make the sum of all rows equal the same number.
Make the sum of each of the rows equal certain numbers. In the hexagons below, place the numbers 1-19 so that rows, columns and diagonals all add up to 38. (Source: Eric W. Weisstein) Extension: Place the numbers 1-19 in the circles so the sum of each of the rows with three circles around the […]
Make the sum of the numbers in the rows, columns, and diagonals of a grid all equal the same integer.
Will the sum of four numbers always be the same?
Consider the use of the word “below” for negative numbers.
Translate letters into numbers.
Manipulate digits to get a sum of 100.
Find a number with a special relationship between two of its digits.
Follow the steps in manipulating a number and be surprised by the result!
Find the perfect squares in a given table.
Using sums and products, what’s the largest number less than 50 that you cannot produce?
Find the square root of a huge number.
Determine the last digit in a huge number.
Find different ways to make change for a dollar.
Use square roots to produce integers.
Find happy numbers and patterns among them.
Put a different number of mice in each cage.
Devise a strategy so that you’re the one leaving the last stick on the table every time.
You know how many legs and heads are in a crowd. Now determine how many horses are there.
Construct triangles with particular attributes.
Find numbers in the hundreds with a special relationship among the digits.
Determine numbers in different bases.
Find the sum of consecutive integers.
Using personally significant dates, you can find a surprising result.
Use the sum of consecutive integers to form certain numbers.
Discover some strange properties about a mysterious number.
Square two-digit numbers in your head.
Find patterns among abundant, deficient, and perfect numbers.
Examine abundant numbers.
Determine if Sam’s claim about abundant numbers is true.
Find abundant numbers.
Which locker doors will be open when a given process is complete?
Explore a possible rule for checking divisibility by eight.
Find a relationship pertaining to the digits in a multiple of 9.
Consider division by 0 and 1.
Determine how long a hair cutter works on a busy day.
Help a census taker figure out a father’s riddle about his daughters’ ages.
Examine the relationship between the denominator and the numerator in fractions with non repeating decimal representations.
Find the divisors of the number N.
Find perfect numbers.
Investigate sums and averages of two consecutive primes.