Curated OER
Time and Timetables
In this recognizing time and timetables instructional activity, students compare Julian and Gregorian calendars, determine leap years, and apply the formula for finding the day of week and Easter day for any year. Students solve 20...
Curated OER
Basic Crypto Systems
Pupils try to solve codes mathematically. The use of a code needs a key. Students try to decipher a code with a mathematical key. This requires focus and higher order thinking skills like analysis.