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

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

  1. 1. Number Adding fractions

    Add: 3⁄7 + 1⁄4

    Answer: 19⁄28
  2. 2. Algebra Two-step equations

    Solve: 5x + 15 = 55

    Answer: x = 8
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 12cm and 16cm

    Answer: 20cm
  4. 4. Ratio Sharing in a ratio

    Divide 52 in the ratio 1:2:1

    Answer: 13, 26 and 13
  5. 5. Statistics Mean

    Calculate the mean of: 11, 8, 49, 30, 20, 36, 12

    Answer: 23.7

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