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Today's Keystones

Five retrieval questions for today — one from each strand. The five skills stay the same for the week, with new numbers each day. Choose your tier, then have a go.

Bedrock Cornerstone Lintel Capstone
Cornerstone · Grades 3–5 Keystones #282 9 October 2026 (today) Skills week 6 of 7

Keystones — Cornerstone

Five GCSE retrieval questions · 9 October 2026

  1. 1. Number Highest common factor

    Find the HCF of 4 and 10

    Answer: 2
  2. 2. Algebra Substitution

    If x = 4, calculate x² + 2x + 3

    Answer: 27
  3. 3. Geometry Circumference of a circle

    Find the circumference of a circle with diameter 16cm

    Answer: 50.27cm
  4. 4. Ratio Percentage multipliers

    What multiplier represents a 28% decrease?

    Answer: 0.72
  5. 5. Statistics Averages and range

    Find the mean, median and range of: 22, 20, 40, 31, 25

    Answer: Mean = 27.6, Median = 25, Range = 20

Same five questions for everyone on Cornerstone today. Only today's set is shown here — a new set appears at midnight UK time.