## Equations – Witty sister (basic)

Concepts addressed: systems of equations, date calculation.Recommended grade: 8th.Difficulty level: Basic.An advanced version of Witty sister is also available. Scenario: You’re visiting your friend at their house, and are soon approached by their little sister. She’s recently taken to riddles, and she can’t wait to tell you her recent one.  With a grin on her […]

## 3D geometry – Building a swimming pool (advanced)

Concepts addressed: percentages, unit conversion, cylinder volume, cylinder area, equilateral triangle area, regular hexagon area.Recommended grade: 7th.Difficulty level: Basic.A basic version of Building a swimming pool is also available. Scenario: This is the year – you’re building an in-ground swimming pool in your backyard! You can already see all the envious faces, but first, someone’s

## 3D geometry – Building a swimming pool (basic)

Concepts addressed: percentages, rectangular prism volume, rectangular prism area, unit conversion, square area.Recommended grade: 7th.Difficulty level: Basic.An advanced version of Building a swimming pool is also available. Scenario: This is the year – you’re finally building an in-ground swimming pool in your backyard! You can already see all the envious faces, but first someone’s got

## Velocity – Mountain trip (advanced)

Concepts addressed: percentages, trigonometry, unit conversion, velocity calculation.Recommended grade: 11th.Difficulty level: Advanced.A basic version of Mountain trip is also available. Scenario: Winter break is here, and you’re planning a trip to the mountains for a few days with three friends. The cabin you’ll be staying at is a hundred miles away, so you decide to

## Equations – Witty sister (advanced)

This scenario tests basic arithmetic, quadratic formula and date calculation.Recommended grade: 8th.Difficulty level: Basic.A basic version of Witty sister is also available. Scenario: You’re visiting your friend at their house and are soon approached by their little sister. She’s recently taken to riddles, and she can’t wait to tell you her most recent one. With

## Velocity – Mountain trip (basic)

Concepts addressed: unit conversion, velocity calculations.Recommended grade: 8th.Difficulty level: Basic.An advanced version of Mountain trip is also available. Scenario: Winter break is here, and you’re planning a trip to the mountains for a few days with three friends. The cabin you’ll be staying in is a hundred miles away, so you decide to make it

## 2D geometry – Helping out on the ranch (advanced)

Concepts addressed: rectangle area, rectangle perimeter, rectangular prism sketching, percentages.Recommended grade: 5th.Difficulty level: Advanced.A basic version of Helping out on the ranch is also available. Scenario: Good Ol’ Uncle Joe invited you to his ranch for the weekend to help him plan out a barn for his horses. He has 14 horses, and each should

## 2D geometry – Helping out on the ranch (basic)

Concepts addressed: rectangle area, rectangle perimeter, square perimeter.Recommended grade: 5th.Difficulty level: Basic.An advanced version of Helping out on the ranch is also available. Scenario: Good Ol’ Uncle Joe invited you to his ranch for the weekend to help him set up an enclosure for his horses. He has 50 horses, and they should each have

## Probability – School lottery (advanced)

Concepts addressed: probability calculation.Recommended grade: 10th.Difficulty level: Advanced.A basic version of School lottery is also available. Scenario: Your school launches a spring lottery in which you can win various prizes. There are 900 lottery tickets, out of which 200 guarantee a prize. These include: single grand prize – a weekend trip, nine secondary prizes –

## Probability – School lottery (basic)

This scenario tests basic arithmetic and probability calculation.Recommended grade: 10th.Difficulty level: Basic.An advanced version of School lottery is also available. Scenario: Your school launches a spring lottery in which you can win various prizes. There are 900 lottery tickets, out of which 200 guarantee a prize. These include: single grand prize – a weekend trip,