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Cornerstone · Grades 3–5 Keystones #1 9 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 9 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 2⁄6 + 1⁄6

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

    Solve: 6x - 10 = 50

    Answer: x = 10
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Share 112 in the ratio 3:4

    Answer: 48 and 64
  5. 5. Statistics Mean

    Find the mean of: 13, 4, 14

    Answer: 10.333333333333

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