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Cornerstone · Grades 3–5 Keystones #1 13 September 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 13 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 6⁄8 + 1⁄8

    Answer: 7⁄8
  2. 2. Algebra Two-step equations

    Solve: 6x + 13 = 55

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

    Find the hypotenuse of a right triangle with sides 8cm and 15cm

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

    Divide 84 in the ratio 1:4:2

    Answer: 12, 48 and 24
  5. 5. Statistics Mean

    Calculate the mean of: 36, 21, 11, 46, 14, 6

    Answer: 22.3

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