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

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

  1. 1. Number Adding fractions

    Add: 2⁄6 + 4⁄5

    Answer: 17⁄15
  2. 2. Algebra Two-step equations

    Solve: 5x + 5 = 60

    Answer: x = 11
  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 85 in the ratio 1:4

    Answer: 17 and 68
  5. 5. Statistics Mean

    Find the mean of: 9, 6, 8, 4, 11

    Answer: 7.6

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