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Cornerstone · Grades 3–5 Keystones #1 14 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 14 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄4 + 1⁄3

    Answer: 5⁄6
  2. 2. Algebra Two-step equations

    Solve: 4x + 13 = 49

    Answer: x = 9
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 9cm and b = 5cm

    Answer: 10.3cm
  4. 4. Ratio Sharing in a ratio

    Divide 160 in the ratio 4:1:3

    Answer: 80, 20 and 60
  5. 5. Statistics Mean

    Calculate the mean of: 41, 12, 13, 20, 34, 12, 6, 15

    Answer: 19.1

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