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

Five GCSE retrieval questions · 1 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 3⁄7 + 1⁄7

    Answer: 4⁄7
  2. 2. Algebra Two-step equations

    Solve: 2x - 16 = 10

    Answer: x = 13
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 15cm and 36cm

    Answer: 39cm
  4. 4. Ratio Sharing in a ratio

    Divide 112 in the ratio 1:4:3

    Answer: 14, 56 and 42
  5. 5. Statistics Mean

    Calculate the mean of: 31, 13, 25, 10, 46, 8, 14, 25

    Answer: 21.5

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