## Brain Teaser #1 – The Magic Triangle

Can you place the digits 1 – 6 into the circles so that each side of the triangle adds to 9?

## Brain Teaser #2 – Number Patterns

Can you find the value of the missing number in the diagram?

## Brain Teaser #3 – Emoji Math

Can you find the value of the missing numbers in the emoji puzzle?

## Brain Teaser #4 – How Old is Luke

When Juno was 8 years old, her brother Luke was half her age. If Juno is 30 years old today, how old is Luke?

## Brain Teaser #5 – Starry Math

Given one angle in a 5-pointed star with a regular pentagon superimposed in the center, can you find ALL the angles in the star?

## Brain Teaser #6 – When Math Gives You Lemons...

Given the expressions here, can you find the value of the apple and lemon?

## Brain Teaser #7 – Math Is Sweet!

Find the value of each icon in the multiplication table.

## Brain Teaser #8 – Futoshiki Puzzle

Fill the boxes with the numbers 1-4 so that each digit appears exactly once in each row and column.

## Brain Teaser #9 – Digit Detector

Use the clues to find the mystery number. Can you solve it in fewer than 8 clues?

## Brain Teaser #10 – Sticker Sum Puzzle

Find the value of each sticker in the addition equation. Each sticker represents a number from 1 to 9. Some of the sticker values have been identified. Find the missing values.

## Brain Teaser #11 – Hungry, Hungry Wolf

If six wolves catch six lambs in six minutes, how many wolves does it take to catch sixty lambs in sixty minutes? Can you determine the answer mathematically given the clues below?

## Brain Teaser #12 – Mirror Puzzle

Create an equation using just the numbers and the mathematical symbols given below.

## Brain Teaser #13 – Easy As 2, 3, 4, 5

MATH. It's as easy as 1-2-3...or...2, 3, 4, 5? Can you create an equation using just the numbers and symbols given here? (Hint: exponents are helpful).

## Brain Teaser #14 – Easy as A, B, C...

When it comes to the A, B, C's of math, it doesn't get much better than this. Can you determine a number (a, b, c, d) that when multiplied by 4 gives you the same number in reverse?

## Brain Teaser #15 – Three's Company

You know that the product of two or more positive whole numbers is almost always more than the sum of those numbers. Can you identify three whole numbers whose sum EQUALS their product?

## Brain Teaser #16 – A Square Triangle

In the immortal words of the 1980's hit-maker, Huey Lewis: 🎵 "It's Hip To Be Square."🎵 In the spirit of this 20th-century sentiment, we bring you this 'hip' Brain Teaser: A Square Triangle. A triangle has angles that are all SQUARE NUMBERS. Find the degree measures of the angles.

## Brain Teaser #17 – All Systems GO

What's better than just one equation? Three! It's 'all systems go' for this Brain Teaser challenge.

## Brain Teaser #18 – Seven Up

Is this brainteaser as light, bubbly and refreshing as its name would imply? We think so. Find 3 ways to put the numbers 1 – 7 into the circles so that each straight line of three numbers adds up to the same total.

## Brain Teaser #19 – A Perfect 100

You may know the saying "If you give 100% all of the time, somehow things will work out in the end." We're here to prove it! Give 100% to this Brain Teaser and we promise it will all work out to a perfect 100 in the end! Using only addition and multiplication, combine the given numbers so that they total 100.

## Brain Teaser #20 – The Monty Hall Problem

Maybe you've heard of this notoriously paradoxical Brain Teaser that gets its name from the old TV game show, Let's Make A Deal. The MONTY HALL problem is a brain teaser in the form of a probability puzzle that has confounded countless numbers of people since it was first posed back in 1975..

## Brain Teaser #21 – Area Puzzle

Get your detective gear out for this Brain Teaser. Can you find the missing area in the given figure?

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