Stack of Circles

Thinning Triangles

Fill the Diagonal

Tower of Triangles

Divide and Color

Area In-Between

Stack of Squares

Plus or Nonplussed?

Carrrs

Ha ha ha ha! Eh...

In for the Win

The Era of the Ear

The Answer Is a Cryptogram, Too

The Power of Math

What Are the Missing Digits?

Play the Odds

How Many Ones?

Cherry Production

Lots of Triangles or One Big One?

The Eye of...

How Many Trailing Zeros?

Even or Odd?

Solutions From Solutions

What's the Last Digit?

Consecutive Sum

Dorian the Builder

How Many Divisors?

The Sum of Ages

Book Prices

What Does Average Look Like?

Exactly 3 Divisors?

What Makes Squares a Little Odd?

What Is Impossible?

One to Three, Three to One

Only Multiply or Divide!

You Won't Get This Number

1 2 3 4 5 6 = 10

Impossible Result

The First Sign

Even to Odd

5 5 5 5 5 = As Big As You Can Make It!

Smallest Odd

String Together a Multiple of Five

Too Many Twos

Is One Value Impossible?

Isn't That Odd?

Prime Five

Get Them on the Other Side

Even It Out

Can You Make It Bigger?

One to Nine

Dividing Decimals

Even or Odd

The Maximum Maximum