Short worksheet to prime students to think about how small boxes would physically fit inside a larger box, rather than simply work out the volume of each and divide to work out how many fit inside (which may not work if the boxes don't fit snugly).

Worksheet (2 pages) and Homework (1 page) (with answers) for Properties of Waves. Including definition of waves in terms of energy, difference between (and examples of) transverse and longitudinal waves, parts of waves such as areas of compression and rarefaction, wavelength and amplitude, and explaining the frequency and period of waves. A corresponding presentation is free to use and embedded at physics.mrhatchard.co.uk in Section 4 (Waves). Written for the Cambridge IGCSE Coordinated Sciences and Combined Sciences courses, but obviously a large content overlap with various GCSE courses also. This resource is the first in a series of resources on the topic of Waves and is being made available as a free sample.

For KS3 or KS4 (particularly low ability). "Crocodile eats the bigger number" using the signs correctly between two values, then between 2 sums, then with a little bit of simple algebra (with values of a, b and c given). Listing the possible integer solutions of a simple inequality. Representing inequalities on a number line, and writing inequalities down from a number line. Quite a few answers to odd questions are done for them to help the students check their own approach as they go.