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

Five GCSE retrieval questions · 5 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 4⁄5 + 2⁄4

    Answer: 13⁄10
  2. 2. Algebra Two-step equations

    Solve: 6x + 15 = 45

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

    Find the hypotenuse of a right triangle with sides 6cm and 8cm

    Answer: 10cm
  4. 4. Ratio Sharing in a ratio

    Share 35 in the ratio 2:3

    Answer: 14 and 21
  5. 5. Statistics Mean

    Find the mean of: 12, 2, 17, 7, 17

    Answer: 11

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