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Cornerstone · Grades 3–5 Keystones #1 19 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 19 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄7 + 1⁄5

    Answer: 17⁄35
  2. 2. Algebra Two-step equations

    Solve: 8x - 7 = 25

    Answer: x = 4
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 12cm and b = 7cm

    Answer: 13.89cm
  4. 4. Ratio Sharing in a ratio

    Divide 162 in the ratio 1:4:1

    Answer: 27, 108 and 27
  5. 5. Statistics Mean

    Find the mean of: 11, 16, 18, 19

    Answer: 16

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