This collection of lesson plans and activities for students aged 9-11 years is based on a science curriculum developed by a group of Caribbean nations. The activities pertain to topics such as place value, prime and composite numbers, the sieve of Eratosthenes, square numbers, factors and multiples, sequences, averages, geometry, symmetry, tessellations, ominoes, measurement, capacity and mass, metric mass, time, money, fractions, decimals, percentage and ratio, graphs, and problem solving. The activities are organized by objectives from the core curriculum and frequently include worksheets for students. (DDR)