Multiple Calculations

Place the digits 1 through 9 in the empty boxes in a special way.

Common Digit

Find the one-digit number that is just like all the others.

Coat Check

How many times will Allison write the digit 3?

Apples and Oranges

They say you cannot add apples and oranges. You do in this puzzle! Can you break the code?

Filling Bases

Find the missing base numbers.

Magic Pairs

How many pairs of “magic” numbers exist?

Clocking the Order

When will the digits of a digital clock be in strictly increasing order? In strictly decreasing order?

Train Tracking

Follow the pattern and determine the number of people who get on and off the train.

Summing Evens

Find a way to sum a set of even integers.

On Target

How many darts will Seong-Chang need to throw to earn a specific number of points?