IMC Key Stage 2 · 3. Divisibility, remainders, LCM and GCD
Work with remainders, add or subtract to reach a common multiple, use the LCM for things that repeat and the GCD for equal pieces, and test divisibility from the digits.
IMC Key Stage 2 (EMIC) – Selected topics
Write a division with remainder correctly and use “same remainder → difference divisible”.
Turn remainder conditions into a common multiple by adding or subtracting.
Find the LCM and GCD and choose which one a problem needs.
Count multiples in a range, including numbers counted twice.
Use divisibility tests to build or check numbers quickly.