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Cornerstone · Grades 3–5 Keystones #1 29 September 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 29 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 69 + 19

    Answer: 79
  2. 2. Algebra Two-step equations

    Solve: 6x + 7 = 61

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

    Find the hypotenuse of a right triangle with sides 20cm and 21cm

    Answer: 29cm
  4. 4. Ratio Sharing in a ratio

    Divide 189 in the ratio 1:2:4

    Answer: 27, 54 and 108
  5. 5. Statistics Mean

    Find the mean of: 6, 5, 16

    Answer: 9