A 10-question multiple-choice quiz covering the breadth of KS1 place value: representing numbers, counting in 2s/5s/10s (Year 2), one more/one less, and comparing numbers with <, >, =. Best-of-N scoring captures the personal best.
Eight flashcards: one side shows a two-digit number (like 34), the other shows its tens-and-ones breakdown with visual blocks. Quick visual reinforcement of the part-whole relationship.