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Cornerstone · Grades 3–5 Keystones #151 31 May 2026 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 31 May 2026 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄6 + 2⁄7

    Answer: 19⁄42
  2. 2. Algebra Two-step equations

    Solve: 8x - 18 = 38

    Answer: x = 7
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 20cm and 21cm

    Answer: 29cm
  4. 4. Ratio Sharing in a ratio

    Divide 144 in the ratio 2:3:1

    Answer: 48, 72 and 24
  5. 5. Statistics Mean

    Find the mean of: 15, 16, 14

    Answer: 15

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