Enigma — Can You Crack the Code?
Students break four intercepted messages: a shift cipher by brute force, a substitution cipher by frequency analysis with real English data, a keyword cipher using…
Home › Interactives › Mathematics › SURDS Challenge
Mathematics · Number
Randomised scored practice across simplifying surds, surd arithmetic, expanding brackets and rationalising simple and binomial denominators, with feedback withheld until the end. The full interactive is available to licensed Education Universe users.
Use as a self-check after the surds explorer and review the questions most students missed.
Start a free 30-day trial with class codes and progress tracking, or talk to us about your school's licence.
Students break four intercepted messages: a shift cipher by brute force, a substitution cipher by frequency analysis with real English data, a keyword cipher using…
Randomised practice simplifying index-law expressions across multiplication, division, powers, zero and negative indices, with worked solutions and a core or extension…
Students change the base and indices to see each index law expressed as repeated multiplication, covering the multiplication and division laws, powers of powers, and…
A randomised ratio challenge in which students simplify ratios, find equivalent ratios, scale and share a quantity in a given ratio, using visual ratio bars and…
A companion lab in which students apply ratios, rates, percentages and percentage change to current Tour de France and weather data. The full interactive is available to…
A guided investigation covering ratio simplification, scaling, unit rates, percentages, discounts and percentage change in real-world contexts. The full interactive is…
SURDS Challenge is one of the licensed interactives in The Education Universe. This page describes it; teachers use it in lessons and classes with a licence or the free trial.