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Cornerstone · Grades 3–5 Keystones #1 17 July 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 17 July 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 3⁄9 + 1⁄9

    Answer: 4⁄9
  2. 2. Algebra Two-step equations

    Solve: 7x - 18 = 17

    Answer: x = 5
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 6cm and b = 9cm

    Answer: 10.82cm
  4. 4. Ratio Sharing in a ratio

    Divide 153 in the ratio 4:1:4

    Answer: 68, 17 and 68
  5. 5. Statistics Mean

    Find the mean of: 10, 3, 12, 8, 6

    Answer: 7.8

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