A no-prep 10-pack of math worksheets covering conditional probability with tree diagrams for Grade 9 / Year 10. 160 math problems across 10 sets with full answer keys — every answer recomputed and verified by code. Print, hand out, teach. What's included • 10 worksheets (Sets A, B, C, D, E, F, G, H, I, J) — same skill, varied numbers, 16 questions each. • Full answer key for each set on a separate page. • Skill tag and standards label on every problem. • A4 print-ready; Verdana / Calibri only (w