## Floating helicopter

In the video below, Matt gets to fly in a helicopter in the name of maths. For particular propellor rotation speeds and video camera frame rates, it can look like the propellors of a helicopter are not moving at all and the helicopter is floating in mid-air. Explore the maths behind this by watching Matt's video and trying our activity.

## Picture Hanging Puzzle

In the video below Matt introduces us to the Picture Hanging Puzzle: how can you hang a picture over some hooks so that if any one of the n hooks comes out, the picture will fall to the ground? Can your students find a solution when n=2, or when n=3?

## Pi Approximation Day

We celebrate Pi Approximation Day on 22nd July (22/7) because as a fraction this is an approximation to Pi. Celebrate Pi Approximation Day by finding other, more accurate, rational approximations to Pi using the continued fractions method.

## Logs Meme

In the video below, Matt explores an internet meme about logarithms. Here we've made some questions for students to have a go at before watching the video.

## Pi Sums

Watch Matt Parker's Pi Day 2019 video (below) where he estimates π using moments and a famous result proved by Euler. Here are some additional problems based on Euler's sum.

## Celebrating Thirdsday

Here is a classroom activity to help you enjoy Thirdsday! Thirdsday celebrates the number 1/3 and occurs when January 3rd (or 1/3 when written as a US date) falls on a Thursday, as it does in 2019. The activity for your students is about an intriguing sum that gives us 1/3.