Open Middle Problem Ten

Today’s Challenge: Using the digits 0-9 only once each, create as many true equations as possible.

Open Middle Problem Nine

Using the digits 0 to 9 at most one time each, fill in the boxes to create a correct sentence.

Swapping Frogs

In this puzzle you need to find a way of swapping the pink and blue frogs.

Open Middle Problem Eight

Use the digits 0 to 9, at most one time each, to solve the problem.

Open Middle Problem Seven

Use the digits 0 to 9, at most one time each, to fill in the boxes so that the sum is as close to 10 as possible.

Open Middle Problem Six

Using the integers -3 to 3, at most one time each, fill in the blanks to make each equation true.

Consecutive Sums

Some numbers are sums of consecutive numbers. For example: 10 = 1 + 2 + 3 + 4 Can you make all the numbers this way?

Open Middle Problem Five

Today’s Challenge: Using the digits 1 to 9 at most one time each, fill in the boxes to make three decimals whose sum is as close to 1 as possible.

Open Middle Problem Four

Using the digits 0 through 9, without repeating any digits, find the quotient closest to 1.

Open Middle Problem Three

Using each of the digits 0-6 only once, make two equivalent ratios.

Open Middle Problem Two

Today’s Challenge: Using the digits from 1 to 9, at most once, make as many true statements as possible.

Open Middle Problem One

Directions: Using the digits 0 to 9 as many times as you want, fill in the boxes to create a correct number sentence.

Kakooma Puzzles

Within each section, find the integer that is the sum of two others within that same section.

Frac-Tangle Puzzles

How many different grid paper rectangles can you create (and colour) that satisfy these puzzle conditions?