IB skill practice

Analyse divisibility proofs

Use divisibility rules, factor structure, and proof logic to justify integer results.

Paper 1, Paper 2 5 marks Difficulty 4

Analyse divisibility proofs - divisibility proof item

Case A6. Use the proof-flow diagram and calculate the requested divisibility proof value.

Worked practice: result and interpretation

Calculate the requested result first, then choose the interpretation that follows from it.