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Cornerstone · Grades 3–5 Keystones #4 4 January 2026 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 4 January 2026 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 3⁄10 + 2⁄10

    Answer: 1⁄2
  2. 2. Algebra Two-step equations

    Solve: 5x + 6 = 21

    Answer: x = 3
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 5cm and b = 9cm

    Answer: 10.3cm
  4. 4. Ratio Sharing in a ratio

    Share 76 in the ratio 1:3

    Answer: 19 and 57
  5. 5. Statistics Mean

    Find the mean of: 12, 20, 12, 16

    Answer: 15

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