Author note — to cover

Use the total of 1 to find an unknown probability in a table; include tables with algebraic entries such as x and 2x solved by a simple linear equation, a Higher-leaning twist Foundation can still meet. Both tiers. Exclude relative frequency tables (Experimental probability) and simultaneous equations (Algebra strand). (P4)

• Fluency — direct questions on finding a missing probability, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).