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Cornerstone · Grades 3–5 Keystones #1 12 September 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 12 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄3 + 3⁄5

    Answer: 19⁄15
  2. 2. Algebra Two-step equations

    Solve: 7x - 20 = 85

    Answer: x = 15
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 8cm and b = 15cm

    Answer: 17cm
  4. 4. Ratio Sharing in a ratio

    Divide 96 in the ratio 2:3:1

    Answer: 32, 48 and 16
  5. 5. Statistics Mean

    Find the mean of: 12, 5, 17, 19

    Answer: 13.25

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